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[UPdated]4.04 LPM danger -> move to LQ5 Kernel [info]& How to screen capture in 4.04

[UPdated]4.04 LPM danger -> move to LQ5 Kernel [info]& How to screen capture in 4.04
Update: Please install a custom recovery if you are running any of the 4.04 kernels. LPM KERNELS ARE MORE AT RISK!!!
I reverted back to LQ5 yesterday because of the issue with Youtube HD not functioning unless I roll back the Youtube version or swap kernels. Aside from that Chainfire has warned me that he will not be releasing and CF-root for LPM because it has an underlying Kernel *possible* brick problem that cannot be alleviated with just updating to custom recovery via CF-Root.
Custom recovery DOES implement a different means of running the wipe factory data reset that *shouldn't* cause a brick. But as per Chainfire's PM we may still be at risk?
http://download.chainfire.eu/202/CF-Root/SGS2/CF-Root-SGS2_XX_OXA_LQ5-v5.6-CWM5.zip
To check if you are one of these people that may have the eMMC corruption and possible bricking of your S2....check for Chainfires app called Gotbrickbug. Also by chainfire.
Gotbrickbug thread
http://forum.xda-developers.com/showthread.php?t=1693704
Check to see if you are at risk BEFORE flashing anything.
1day 9hours and 11% discharging. 48% is screen so usage is about right seeming we sleep half the time LOL Me a bit more so than most others haha. Damn Narcolepsy
James
Screen capture method for 4.04 ICS Samsung is now long press button then long press home button; and in that order too. Not power and volume down like on 4.03.
Either use these and or wait for my ROM to be released via Darky if you are not confident.
Please give all credits to Chainfire for this, without him XDA would not have Root, so be thankful this guy continues to support us all.

This AWESOMELY INCREDIBLE
Phone: XXLQ5 (Android 4.0.4)
Modem: XXLQ6
Kernel: Stock (unrooted)
Launcher: Apex 1.2.4

..

tariq2kn said:
This AWESOMELY INCREDIBLE
Phone: XXLQ5 (Android 4.0.4)
Modem: XXLQ6
Kernel: Stock (unrooted)
Launcher: Apex 1.2.4
Click to expand...
Click to collapse
You're on LQ5, you may want to ditch the kernel and run with LPM man. Its the wipe script that is in the recovery that will corrupt your eMMC. Not just the stupid .PIT file that it came with + stupid people trying to restore from a custom kernel after the repartition. Both are issues with LQ5.
Attached is the LPM ZImage + CWM apk. Use CWM apk by chainfire to flash the zImage. Then flash this
http://download.chainfire.eu/202/CF-Root/SGS2/CF-Root-SGS2_XX_OXA_LQ5-v5.6-CWM5.zip
That will give you root and recovery too DO NOT WIPE ON THE CURRENT LQ5 KERNEL!!
Attachments now removed as per Chainfires instructions. For future reference please don't redistribute his CWM app, it gets installed with the CF-root flash anyway.

You seem to be saying that LPM has a safe kernel, while in fact it hasn't. There are even reports of people bricking their s2 by using the official recovery (not cwm) under stock lpm kernel.

Any of the newer firmwares than LQ5 seems to be very dangerous! Russian forums reported many people to have hard bricked their devices also whilst wiping data partition on lwm kernel...
So be aware of any leaked firmwares and only use official ones or those confirmed by chain fire for be working...
Sent from my GT-I9100 using xda app-developers app

tylerdurden83 said:
You seem to be saying that LPM has a safe kernel, while in fact it hasn't. There are even reports of people bricking their s2 by using the official recovery (not cwm) under stock lpm kernel.
Click to expand...
Click to collapse
Really?
Hmmm I may have to look into branching siyah sooner than i expected. He has a lot on his plate atm, so will look into this. I have never built a kernel but afaik its relatively simple. Its the extra features that people want that is the time consumer. Well I would recommend that users flash the recovery that I have given the link to and utilise that.
If that is the case they should be able to run the LQ5 kernel and flash that recovery? I have just contacted chainfire first to give cred which I think a lot of us forget that he is a dev and we all use his work on this forum. Just because its mainstream doesn;t mean it should be forgotten about Anyway I have enquired about the recovery and wipe proceedure compared to the standard recovery wipe proceedure and I will report back here when/if I hear back.
Right now I am going to flash back to LQ5 and custom recovery

River99 said:
Any of the newer firmwares than LQ5 seems to be very dangerous! Russian forums reported many people to have hard bricked their devices also whilst wiping data partition on lwm kernel...
So be aware of any leaked firmwares and only use official ones or those confirmed by chain fire for be working...
Sent from my GT-I9100 using xda app-developers app
Click to expand...
Click to collapse
From my understanding its the wipe procedure. So if that is fine on CF-root because of the custom recovery then shouldn't we be encouraging more people to flash CF-root?

Jarmezrocks said:
Your on LQ5, you may want to ditch the kernel and run with LPM man. Its the wipe script that is in the recovery that will corrupt your eMMC. Not just the stupid .PIT file that it came with + stupid people trying to restore from a custom kernel after the repartition. Both are issues with LQ5.
Attached is the LPM ZImage + CWM apk. Use CWM apk by chainfire to flash the zImage. Then flash this
http://download.chainfire.eu/202/CF-Root/SGS2/CF-Root-SGS2_XX_OXA_LQ5-v5.6-CWM5.zip
That will give you root and recovery too DO NOT WIPE ON THE CURRENT LQ5 KERNEL!!
Click to expand...
Click to collapse
Great. But somewhere i still fear after cwm problem with lq5. I am on stock lq5 firmware & kernel. How to safely go about it.
Phone: XXLQ5 (Android 4.0.4)
Modem: XXLQ6
Kernel: Stock (unrooted)
Launcher: Apex 1.2.4

Jarmezrocks said:
Really?
Hmmm I may have to look into branching siyah sooner than i expected. He has a lot on his plate atm, so will look into this. I have never built a kernel but afaik its relatively simple. Its the extra features that people want that is the time consumer. Well I would recommend that users flash the recovery that I have given the link to and utilise that.
If that is the case they should be able to run the LQ5 kernel and flash that recovery? I have just contacted chainfire first to give cred which I think a lot of us forget that he is a dev and we all use his work on this forum. Just because its mainstream doesn;t mean it should be forgotten about Anyway I have enquired about the recovery and wipe proceedure compared to the standard recovery wipe proceedure and I will report back here when/if I hear back.
Right now I am going to flash back to LQ5 and custom recovery
Click to expand...
Click to collapse
Yes some have bricked in lpm too. Have heard this from from russian forum.
Phone: XXLQ5 (Android 4.0.4)
Modem: XXLQ6
Kernel: Stock (unrooted)
Launcher: Apex 1.2.4

I get a solid 2 days from Wanamlite v12 (4.03 LPG) with siyah 3.3.2+ (LP9)
Sent from my Xoom using XDA Premium HD app

tariq2kn said:
Great. But somewhere i still fear after cwm problem with lq5. I am on stock lq5 firmware & kernel. How to safely go about it.
Phone: XXLQ5 (Android 4.0.4)
Modem: XXLQ6
Kernel: Stock (unrooted)
Launcher: Apex 1.2.4
Click to expand...
Click to collapse
Well get off the stock recovery is what I am saying!!! Get off it now!! Your at risk right now. Just cause you flashed it and didn't get the brick doesn't mean you won't. It is when you do a factory data reset that you **could** get a corrupted eMMC. Doesn't mean you will...just means that at the moment you are at risk if you ever do a reset on your phone in recovery.
see the link in my second post to chainfires website. Download that LQ5 CF-root and flash that via Odin.
This adds a custom recovery 5.x to your phone and it should by pass the stock kernel 3e recovery when you boot into it via the CWManager app (this is in the attachment) I will put it in there sepperated now for users like your self that already have LQ5. If you want to boot into recovery you do so via this app only. It will take you to the clockwork recovery console not the standard 3e one that comes with the kernel and firmware.
I hope this all makes sense now?

Rone1986 said:
I get a solid 2 days from Wanamlite v12 (4.03 LPG) with siyah 3.3.2+ (LP9)
Sent from my Xoom using XDA Premium HD app
Click to expand...
Click to collapse
Yeah I know this. It has a lot to do with other factors like the modem and network that you are on also. Wanamlite is a great ROM too btw. This was just for 4.04 as its not really relevant to 4.03

Jarmezrocks said:
See the attached screen capture taken 2 min ago. LPM kernel is working flawlessly with LQ5. Wipes/ backup/ restores etc. Via the root and recovery thanks to Chainfire.
I used the LQ5 updated root flash via Chainfires CWM app to patch the LPM kernel.
ROM will be updated to DarkyROM very soon, so make sure you visit to check it out.
1day 9hours and 11% discharging. 48% is screen so usage is about right seeming we sleep half the time LOL Me a bit more so than most others haha. Damn Narcolepsy
James
Click to expand...
Click to collapse
"1day 9hours and 11% discharging. 48% is screen" dosn't say anything!
I can easily get much more than this if I don't use my phone !!!
Screen on time?
Brightness?

Mittaa said:
dosn't say anything!
I can easily get much more than this if I don't use my phone !!!
Screen on time?
Brightness?
Click to expand...
Click to collapse
Just checked now and my screen brightness was the default 70% as it was when I flashed. I haven't changed it because I am currently working on getting the Jkay Toggles and framework translated over to 4.04. I usually have it set to automatic.
Screen on time: 4hours 29m and 44s
It was more a note for those that are looking how the standard kernel runs. I know custom kernels run a heap better. I would be on siyah kernel if I could run it but I can't. If you compare kernels custom 4.03 to stock 4.04 you aint really comparing apples with apples are you? I hate apples now so I should change my lingo
But you get the jist.
How did I know this was going to turn into critics paradise as per usual? This forum is full of em. I hate CRITICS MORE THAN APPLE!

@ Jarmezrocks
Which modem are you using dear?
Is CWManager App really needed when cfroot 5.6 has already been flashed via odin?
Below is the procedure I think maybe correct:
I) Flash CF-Root LQ5 5.6 via odin in download mode.
II) Flash LPM Kernel via odin in download mode.
No wipe or factory reset shall be done anywhere.
Is it correct?
Phone: XXLQ5 (Android 4.0.4)
Modem: XXLQ6
Kernel: Stock (unrooted)
Launcher: Apex 1.2.4

Jarmezrocks said:
Just checked now and my screen brightness was the default 70% as it was when I flashed. I haven't changed it because I am currently working on getting the Jkay Toggles and framework translated over to 4.04. I usually have it set to automatic.
Screen on time: 4hours 29m and 44s
It was more a note for those that are looking how the standard kernel runs. I know custom kernels run a heap better. I would be on siyah kernel if I could run it but I can't. If you compare kernels custom 4.03 to stock 4.04 you aint really comparing apples with apples are you? I hate apples now so I should change my lingo
But you get the jist.
How did I know this was going to turn into critics paradise as per usual? This forum is full of em. I hate CRITICS MORE THAN APPLE!
Click to expand...
Click to collapse
Thats good :good:
3 hours screen on at 30-50 brightness can last a full day for me on my current firmware (no wifi, no BT, no gaming).

I have rooted the LQ5 with CF-Root LQ5 v5.6 via odin & flashed the attached LPM kernel through CWM Manager.It's working fine.
One thing is that when i opened cwm manager after reboot, it says this version should be used with cf-root 5.0. Some features will be disabled.
I don't think it is going to affect anything as it is about the software features.
Phone: XXLQ5 (Android 4.0.4)
Modem: XXLQ6
Kernel: XWLPM
Root: CF-Root LQ5 v5.6
Launcher: Apex 1.2.4

[Solved][GT-I9500] GPSD kernel wakelock prevent my phone from deep sleep

GPSD wakelock won't let my phone enter deep sleep even a second!!!
Problem started when I make a full wipe on wanamlite android 4.3 with perseus17 kernel and flashed omega android 4.4 rom with perseus 18 kernel. Now I'm back to 4.3 but gpsd wakelock still there.
Here's what I have tried
1.flash wanamlite 4.4 rom with stock repacked kernel with full wipe
2.flash wanamlite 4.4 rom with perseus 18 kernel with full wipe
3.flash hassan android 4.4 rom with full wipe with perseus18 kernel
4.Flash phoenix rom android 4.3 (rom come with perseus kernel) with full wipe with mk9 modem.
5.flash wanamlite android 4.3 rom with full wipe with perseus 17 kernel
6.flash wanamlite android 4.3 rom with full wipe with adam kernel (come with rom)
After flash rom with full wipe the problem had gone for a day and came back the next day.
I use bbs to see wakelock.
I have already turned off the gps and location service in setting.
Edit: Problem solved. The root of problem seem to be from 3G signal from my network operators in my country (AIS)(A lot of people in my country also facing the same problem) and they have already fixed it today.
Sent from my GT-I9500 using xda app-developers app

NonXtreme said:
Problem started when I make a full wipe on wanamlite android 4.3 with perseus17 kernel and flashed omega android 4.4 rom with perseus 18 kernel. Now I'm back to 4.3 but gpsd wakelock still there.
Here's what I have tried
1.flash wanamlite 4.4 rom with stock repacked kernel with full wipe
2.flash wanamlite 4.4 rom with perseus 18 kernel with full wipe
3.flash hassan android 4.4 rom with full wipe with perseus18 kernel
4.Flash phoenix rom android 4.3 (rom come with perseus kernel) with full wipe with mk9 modem.
5.flash wanamlite android 4.3 rom with full wipe with perseus 17 kernel
6.flash wanamlite android 4.3 rom with full wipe with adam kernel (come with rom)
After flash rom with full wipe the problem had gone for a day and came back the next day.
I use bbs to see wakelock.
I have already turned off the gps and location service in setting.
Please help!
Sent from my GT-I9500 using xda app-developers app
Click to expand...
Click to collapse
please stop stressing yourself!
let your phone stabilize for some more time because after a full install everything have to settle and the applications find their steps.
no battery benchmark can accurately be done the first day of use.
Anyway, thanks you, you demonstrated me that we can downgrade and move from many different kernel without any issue. I am very cautious going forward to KK roms for what they give as improvement versus 4.3.

Bump
Sent from my GT-I9500 using xda app-developers app

This issue also drive me insane.
I totally wipe my phone flash diferent ROM (Omega v18 and latest Wanam) also greenify a lot of app but I can't get rid of GPSD wakelock

Please help ?
Bump....
Sent from my GT-I9500 using xda app-developers app

AndreiLux i love u but u don t love kies
PERSEUS 18 is so good i like it AndreiLux if u are a babe so u are hot
But, 16 is not kies friends, so i go back on 15, and : next week i will give u 10 euros, and i think everybody users of this so hot kernel would do the same

Hi!
I had the same problem a while back and found a solution, check my thread http://forum.xda-developers.com/showthread.php?t=2623112
---------- Post added at 08:58 PM ---------- Previous post was at 08:56 PM ----------
Oh, and now that we are at it, your l2_hsic wakelock could probably be solved by disabling Fast Dormancy with this app: https://play.google.com/store/apps/details?id=com.gokhanmoral.fastdormancytoggle.i9300
(Works fine with i9500 even if it wasnt written for it)

NonXtreme said:
GPSD wakelock won't let my phone enter deep sleep even a second!!!
Problem started when I make a full wipe on wanamlite android 4.3 with perseus17 kernel and flashed omega android 4.4 rom with perseus 18 kernel. Now I'm back to 4.3 but gpsd wakelock still there.
Here's what I have tried
1.flash wanamlite 4.4 rom with stock repacked kernel with full wipe
2.flash wanamlite 4.4 rom with perseus 18 kernel with full wipe
3.flash hassan android 4.4 rom with full wipe with perseus18 kernel
4.Flash phoenix rom android 4.3 (rom come with perseus kernel) with full wipe with mk9 modem.
5.flash wanamlite android 4.3 rom with full wipe with perseus 17 kernel
6.flash wanamlite android 4.3 rom with full wipe with adam kernel (come with rom)
After flash rom with full wipe the problem had gone for a day and came back the next day.
I use bbs to see wakelock.
I have already turned off the gps and location service in setting.
Edit: Problem solved. The root of problem seem to be from 3G signal from my network operators in my country (AIS)(A lot of people in my country also facing the same problem) and they have already fixed it today.
Sent from my GT-I9500 using xda app-developers app
Click to expand...
Click to collapse
Hey, do you have a bit more information about what exactly in your network operator causes this to happen? I had the same problem (infinite GPSD wakelock) for ages here in Venezuela, yet whenever I traveled abroad, the wakelock didn't show up, so I assume it's my network operator as well. Is it something only the operator can fix or is it like Fast Dormancy where you can toggle it on your phone? The drain is so bad the only solution that worked for me was crippling the GPS by renaming the gpsd file

sirius100 said:
Hey, do you have a bit more information about what exactly in your network operator causes this to happen? I had the same problem (infinite GPSD wakelock) for ages here in Venezuela, yet whenever I traveled abroad, the wakelock didn't show up, so I assume it's my network operator as well. Is it something only the operator can fix or is it like Fast Dormancy where you can toggle it on your phone? The drain is so bad the only solution that worked for me was crippling the GPS by renaming the gpsd file
Click to expand...
Click to collapse
I know it might be a little late my friend... WAY too late, but i'm also from Venezuela, and i also have this particular problem. Setting your device to WCDMA only in Network Mode AND disabling Fast Dormancy with Gokhanmoral's app should do the trick, i'm already noticing some idling of the network activity (which was causing the gpsd wakelock in the first place)... hope it helps!

Downgrade G900H from Lollipop to Kitkat?

I seem to be having an issue with downgrading my S5 G900H Exynos to Kitkat from Lollipop BOAD. I've tried 4 different stock Kitkat firmwares from sammobile but all of them cause the phone to hang at the Samsung logo however I can flash back to stock lollipop BOAD and it works fine again.
ODIN gives me no errors when I try to flash kitkat or lollipop and infact both gives the "PASS!" mark what should I do?

I downgraded to KK from LP the other day, and ended up stuck at the Samsung logo too
Tried factory resetting, didn't work
The only thing that finally worked was flashing the same KK ROM again over the top of the one that got stuck at the Logo
Once I'd done that, it booted

*Detection* said:
I downgraded to KK from LP the other day, and ended up stuck at the Samsung logo too
Tried factory resetting, didn't work
The only thing that finally worked was flashing the same KK ROM again over the top of the one that got stuck at the Logo
Once I'd done that, it booted
Click to expand...
Click to collapse
Doesn't seem to work for me bud

CntrlAltDel45 said:
Doesn't seem to work for me bud
Click to expand...
Click to collapse
You might need to flash the PIT file for your model S5, maybe the partitions are different between ROMs for that specific model
Be sure to get the exact PIT file though or you'll brick it
PIT file and KK ROM in ODIN at the same time, it will flash the PIT, then it will flash the ROM

*Detection* said:
You might need to flash the PIT file for your model S5, maybe the partitions are different between ROMs for that specific model
Be sure to get the exact PIT file though or you'll brick it
PIT file and KK ROM in ODIN at the same time, it will flash the PIT, then it will flash the ROM
Click to expand...
Click to collapse
I cant seem to find those pit files bud

CntrlAltDel45 said:
I cant seem to find those pit files bud
Click to expand...
Click to collapse
Check here, post 2
http://forum.xda-developers.com/showthread.php?t=2737448

*Detection* said:
Check here, post 2
http://forum.xda-developers.com/showthread.php?t=2737448
Click to expand...
Click to collapse
Thanks for your support so far bud but the pit file there for my phone model is only for 16GB versions and mine is 32GB

CntrlAltDel45 said:
Thanks for your support so far bud but the pit file there for my phone model is only for 16GB versions and mine is 32GB
Click to expand...
Click to collapse
No probs, I`ll see if I can find one, in the meantime try requesting it in that thread

*Detection* said:
No probs, I`ll see if I can find one, in the meantime try requesting it in that thread
Click to expand...
Click to collapse
It is possible for me to reflash the phone with lollipop firmware and install custom recovery could I flash stock rom via that custom recovery?

CntrlAltDel45 said:
It is possible for me to reflash the phone with lollipop firmware and install custom recovery could I flash stock rom via that custom recovery?
Click to expand...
Click to collapse
You could flash a custom recovery like TWRP, but unless someone has made a flashable zip of the stock firmware for custom recovery it'll not work
You could flash a custom KitKat ROM from TWRP
The only method that works for mine is flashing CF Auto Root, to gain root, then using TWRP manager from Google Play to install TWRP Recovery
This will void your warranty though

*Detection* said:
You could flash a custom recovery like TWRP, but unless someone has made a flashable zip of the stock firmware for custom recovery it'll not work
You could flash a custom KitKat ROM from TWRP
The only method that works for mine is flashing CF Auto Root, to gain root, then using TWRP manager from Google Play to install TWRP Recovery
This will void your warranty though
Click to expand...
Click to collapse
Mine is similar to that too. I have to install CF Auto Root first and then install Flashify and then install TWRP via flashify img file to gain custom recovery

Might be worth flashing a custom KK ROM, then trying to flash stock over the top after 100% wiping everything & formatting from TWRP advanced wipe

*Detection* said:
Might be worth flashing a custom KK ROM, then trying to flash stock over the top after 100% wiping everything & formatting from TWRP advanced wipe
Click to expand...
Click to collapse
I'm working on that now mate. I appreciate your assistance so far.

No bother, Lollipop not your taste?
I went back to KK just to see what everyone was on about, lasted a couple hours and flashed back to LP, some people get great LP performance, some bad, for me LP is way better

*Detection* said:
No bother, Lollipop not your taste?
I went back to KK just to see what everyone was on about, lasted a couple hours and flashed back to LP, some people get great LP performance, some bad, for me LP is way better
Click to expand...
Click to collapse
I actually prefer lollipop over kitkat but the performance is horrible and i have to charge my phone 3 times daily

CntrlAltDel45 said:
I actually prefer lollipop over kitkat but the performance is horrible and i have to charge my phone 3 times daily
Click to expand...
Click to collapse
Stupid question, but you did factory reset after upgrading to LP?
KK leaves behind rubbish files which cause battery drain, I got the same after first upgrade, but after a reset, it has been great since
Performance is definitely better with LP this end too, but you're not alone, the majority who upgraded say KK is way better atm

*Detection* said:
Stupid question, but you did factory reset after upgrading to LP?
KK leaves behind rubbish files which cause battery drain, I got the same after first upgrade, but after a reset, it has been great since
Performance is definitely better with LP this end too, but you're not alone, the majority who upgraded say KK is way better atm
Click to expand...
Click to collapse
Yep bud.
I decided to install a custom lollipop rom Zephyr Lite to address the battery and performance issues, if it works out well I will use it as my daily driver.

Nice one, fingers crossed

*Detection* said:
Nice one, fingers crossed
Click to expand...
Click to collapse
I installed a custom rom called XtreSoLite with Aroma addon and so far I'm happy with it. I tried Zypher Lite but it didn't work, rooting failed and had all sorts of problems so I'm glade to say I'll stay with XtreSoLite for now.
Thanks for your help mate

Good stuff, I was gonna suggest that exact ROM weirdly, I haven't tried it yet but heard good things about it

Battery drain after re-root to stock rom

I have rooted my S6 edge+ with custom rom via TWRP. Now I have just rooted back to stock rom (THL). But it drains my battery very fast overnight. What should I do to fix this?
Thanks guys!

Same here interested to know what's happening. Nothing in the battery manager but phone is always luke warm it's doing something.

nuzone said:
I have rooted my S6 edge+ with custom rom via TWRP. Now I have just rooted back to stock rom (THL). But it drains my battery very fast overnight. What should I do to fix this?
Thanks guys!
Click to expand...
Click to collapse
I don't know for sure, but I saw very hi usage of supersu in wakelock detector... 2.78v had many issues with battery drains, don't know if 2.79v has...

How do you re-root to a stock ROM after you came from a custom one? Lmao. I'd assume either 1 of 2 things happened,
You didn't erase battery stats in battery manager at 100% then unplug charger before rebooting,
Or you still have a systemless root running and that's just a god awful way to root all around.

LilAnt530 said:
How do you re-root to a stock ROM after you came from a custom one? Lmao. I'd assume either 1 of 2 things happened,
You didn't erase battery stats in battery manager at 100% then unplug charger before rebooting,
Or you still have a systemless root running and that's just a god awful way to root all around.
Click to expand...
Click to collapse
I re-rooted to stock rom just one step from custom one by downloaded official firmware from sammobile.com and flashed by using Odin. That's it. Then my s6 edge+ rebooted by itself.
So how can I erase battery stats? What should I do next?
Thanks

nuzone said:
I have rooted my S6 edge+ with custom rom via TWRP. Now I have just rooted back to stock rom (THL). But it drains my battery very fast overnight. What should I do to fix this?
Thanks guys!
Click to expand...
Click to collapse
Just flash arter97 kernel is oke

Would a factory reset increase performance and battery life?

Hello guys. I have a Galaxy S4 (TouchWiz Lollipop 5.0.1) that is rooted with KingRoot (I replaced KingRoot with SuperSU anyway), has a stock ROM, a custom kernel and TWRP recovery. I did install a custom kernel because I wanted to improve the performance and the battery life, but I noticed that even with tweaking settings a bit in STweaks , my battery life and overall performance hasn't improved. Especially the battery, it drains so fast.
My kernel is an Imperium Kernel (https://forum.xda-developers.com/galaxy-s4/i9505-develop/kernel-imperium-ll-kernel-v1-0-t3058867). I chose this one because it works well with stock ROM.
What I'm thinking is that I've been updating my phone from KitKat 4.2 but I've never wiped cache or factory reset anything, so maybe some "incompatibility" is causing this bad performance and battery drain?
If I wanted to factory reset my phone now from the TRWP recovery (without touching /system of course), would it cause incompatibility with the stock ROM and the custom kernel? And would it somehow help me improve my phone performance and battery duration?

Don't think so.
A custom ROM would make a true difference to general performance, but battery life may vary.

I found this ROM made by the same dev who made the kernel.
If I flash this, will it erase my current kernel?
https://forum.xda-developers.com/galaxy-s4/i9505-develop/rom-imperium-ll-v1-0-t3046889

zAndryZ said:
I found this ROM made by the same dev who made the kernel.
If I flash this, will it erase my current kernel?
https://forum.xda-developers.com/galaxy-s4/i9505-develop/rom-imperium-ll-v1-0-t3046889
Click to expand...
Click to collapse
It's still TouchWiz. TouchWiz is not known for its performance, that's why many people choose AOSP or Lineage.

@Pwnycorn , could u help me?
First of all sorry that I asked a question here but I had to do this as I wasn't answered in my thread.
I flashed a custom Kernel and now I've lost my network signals. Although my phone detects sim card as I can see contacts but I'm unable to make call? When I installed stock rom nothing happened. I tried restoring boot.img with no luck as every time my phone doesn't even boot after restoring boot.img.

munimjaffer said:
@Pwnycorn , could u help me?
First of all sorry that I asked a question here but I had to do this as I wasn't answered in my thread.
I flashed a custom Kernel and now I've lost my network signals. Although my phone detects sim card as I can see contacts but I'm unable to make call? When I installed stock rom nothing happened. I tried restoring boot.img with no luck as every time my phone doesn't even boot after restoring boot.img.
Click to expand...
Click to collapse
Then reflash your current ROM.

munimjaffer said:
@Pwnycorn , could u help me?
First of all sorry that I asked a question here but I had to do this as I wasn't answered in my thread.
I flashed a custom Kernel and now I've lost my network signals. Although my phone detects sim card as I can see contacts but I'm unable to make call? When I installed stock rom nothing happened. I tried restoring boot.img with no luck as every time my phone doesn't even boot after restoring boot.img.
Click to expand...
Click to collapse
Not interrupting anything, as Pwnycorn already answered your question, just wanted to say that cross posting is forbidden here and against XDA Rulez.
Thanks in advance

Pwnycorn said:
Then reflash your current ROM.
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Click to collapse
I know reflashing ROM would help but can't installing a custom Kernel help??

munimjaffer said:
I know reflashing ROM would help but can't installing a custom Kernel help??
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Click to collapse
Wasn't your problem caused by this in the first place?

Pwnycorn said:
Then reflash your current ROM.
Click to expand...
Click to collapse
Pwnycorn said:
Wasn't your problem caused by this in the first place?
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Click to collapse
No sorry I mean if I flash a JB stock kernel to my KK rom, would it cause problems?
Sorry but I've got no idea about kernels.

munimjaffer said:
No sorry I mean if I flash a JB stock kernel to my KK rom, would it cause problems?
Sorry but I've got no idea about kernels.
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Click to collapse
Of course it would! They are for different Android versions; it's like trying to put a cube into a triangle shaped hole.