Database Users

[Q], kernel help?

Basically I've never flashed a custom kernel before so I'm trying to do some research so if someone could give me some incite or point me in the right direction I'd really appreciate it.
The only thing I'm not sure of is if I flash a custom kernel will it prevent me from receiving any future ota updates? If so, any ideas where to find a flashable stock kernel? I couldn't find one. I really want to stay with the stock rom. Had my fill of custom roms on my phone.
Sent from my Nexus 7

Y u not like roms?!
nick2418 said:
Basically I've never flashed a custom kernel before so I'm trying to do some research so if someone could give me some incite or point me in the right direction I'd really appreciate it.
The only thing I'm not sure of is if I flash a custom kernel will it prevent me from receiving any future ota updates? If so, any ideas where to find a flashable stock kernel? I couldn't find one. I really want to stay with the stock rom. Had my fill of custom roms on my phone.
Sent from my Nexus 7
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Click to collapse
Let's see. AFAIK yes, non-stock kernels will prevent you from getting those long-awaited OTAs (not sure though as the first thing I did after getting my N7 was to flash PA ).
If you really like the stock experience but still want a custom kernel, you must flash a custom recovery to flash kernels. The latest TWRP touch is what you need.
After you've flashed the recovery, just download the kernel zip, reboot to recovery, flash, profit.
As for a kernel, you can go with M-Kernel, DerKernel, franco.Kernel, Faux and so on and so forth. I love M-Kernel personally. You can tweak it with TricksterMOD for a smokin' good overclock as well as purty good battery life
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Also, just asking, what do you mean by a "a flashable stock kernel"? If you already have the stock kernel, why flash the same over it?
AFAIK updates to stock kernel are provided by OTAs.

I guess I was looking for a way to return to the stock kernel if need be. I have my recovery and understand that part. Just trying to make sure I understand kernels better before I brick my n7. Thanks for the help!
Sent from my Nexus 7

i also need a stock flashable kernel..just in cased i wan to revert back...
Sent from both my sexy galaxy nexus and nexus 7 X)

nick2418 said:
I guess I was looking for a way to return to the stock kernel if need be. I have my recovery and understand that part. Just trying to make sure I understand kernels better before I brick my n7. Thanks for the help!
Sent from my Nexus 7
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Click to collapse
Oh, ok. If you flash the stock ROM, it flashes the kernel as well (but it's a lot of work reflashing a ROM just for the kernel )
What you can do is this: extract the stock ROM zip and flash the boot.img you get.
Here's a link to the stock ROM: https://dl.google.com/dl/android/aosp/nakasig-jop40d-factory-efcec044.tgz
Edit: I figured I'd explain the rest as well...
After you download that file, untar it: nakasig-jop40d-factory-efcec044.tgz will untar to a folder probably named:nakasig-jop40d-factory-efcec044
Open that folder. You will find a zip (probably image-nakasig-jop40d.zip or something like that), unzip it.
You'll find four files. boot.img is the one you need. Flash it to your device with fastboot.
If you wan a flashable zip, unzip any custom kernel, replace the awesome custom boot.img with the boring stock one and rezip. You should be able to flash it from TWRP or CWM.
Note that the stock kernel nukes CWM on first boot. I assume you don't have root. Do this:
1. Connect the N7 to your PC. [you should have debugging enabled in dev options]
2. Open an adb shell and type this: mv /system/recovery-from-boot.p /system/recovery-from/boot.p.bak
3. ???
4. Profit
[If you do have root, open a file manager, remount /system as read/write and rename /system/recovery-from-boot.p to something.]
Click thanks if I helped!

That's why I was hoping to find the JOP40D stock kernel as a flashable zip. But I'll give the boot. I'm a shot. Thanks again!
Sent from my Nexus 7

nick2418 said:
That's why I was hoping to find the JOP40D stock kernel as a flashable zip. But I'll give the boot. I'm a shot. Thanks again!
Sent from my Nexus 7
Click to expand...
Click to collapse
I added some stuff, see if it helps.
It would be nice if you clicked "thanks" below my post

stock flashable 4.1.2 kernel for grouper(put up by faux as a "reset" kernel) http://faux.androidro.ms/grouper-faux123-reset-kernel-4.1.2.zip (should be fine on 4.2.1)
flashable in twrp or cwm recovery. no hoops to jump through flashing or after flashing this. it doesnt nuke your recovery.

simms22 said:
stock flashable 4.1.2 kernel for grouper(put up by faux as a "reset" kernel) http://faux.androidro.ms/grouper-faux123-reset-kernel-4.1.2.zip
flashable in twrp or cwm recovery. no hoops to jump through flashing or after flashing this. it doesnt nuke your recovery.
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Will that work with OP's 4.2.1?

Awesoham said:
Will that work with OP's 4.2.1?
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yea. i occasionally run a 4.1.2 trinity kernel on my 4.2.1 rasbean jelly rom

Kernel/Recovery question

I'm just coming from the S2 EG4T where, from what I understand, the kernel and recovery were all contained in one file. Is this different for the S4...are they separate?
If they are separate files, I am rooted, and want to get a custom recovery so I can flash some mods. Do I also need a custom kernel or do I only need a custom kernel to over/underclock/get additional governors and schedulers?
Thanks for helping me understand this new phone of mine.
Foulwx

yes recovery is separate thankfully. you are free to flash kernels all you want and your recovery will be untouched.
see the kernel threads for info on what they features they offer.

Foulwx said:
I'm just coming from the S2 EG4T where, from what I understand, the kernel and recovery were all contained in one file. Is this different for the S4...are they separate?
If they are separate files, I am rooted, and want to get a custom recovery so I can flash some mods. Do I also need a custom kernel or do I only need a custom kernel to over/underclock/get additional governors and schedulers?
Thanks for helping me understand this new phone of mine.
Foulwx
Click to expand...
Click to collapse
Yups, what lafester said is corrrect. For the recovery, I recommend TWRP v2.5.0.2. You can download and install via Goomanager from the app store. It's a touch-based recovery and it also supports up to 64GB exFat microSDs.
As for custom kernels, my current favorite is agat's v0.2.0 kernel.

Upgrading to Lollipop

I currently have 4.4.2, rooted with TWRP
Should I upgrade to Lollipop?
Is it possible to upgrade without losing anything from my phone?
How do I upgrade?

MrDavey said:
I currently have 4.4.2, rooted with TWRP
Should I upgrade to Lollipop?
Is it possible to upgrade without losing anything from my phone?
How do I upgrade?
Click to expand...
Click to collapse
- Lollipop doesn't use the ram as efficiently. But otherwise, I find it better. So yes, I suggest upgrading.
- It is a very good idea to wipe data. You can do a backup with Titanium. You can keep what you have on internal storage.
- First install newest TWRP by Blastagator.
- Find a good lp ROM for your model. For d802, I suggest Somboons' SRKG2.
- Somboons ROM includes the new bootstack, but if your chosen ROM doesn't, you'll need to flash that as well.
- Install ROM, wipe data & cache
- install Dorimanx' kernel. This is optional, but a lot better.
Another way to do it is to flash the newest official KDZ for your model. You'll lose root and TWRP, but you can add those afterwards.

runekock said:
- Lollipop doesn't use the ram as efficiently. But otherwise, I find it better. So yes, I suggest upgrading.
- It is a very good idea to wipe data. You can do a backup with Titanium. You can keep what you have on internal storage.
- First install newest TWRP by Blastagator.
- Find a good lp ROM for your model. For d802, I suggest Somboons' SRKG2.
- Somboons ROM includes the new bootstack, but if your chosen ROM doesn't, you'll need to flash that as well.
- Install ROM, wipe data & cache
- install Dorimanx' kernel. This is optional, but a lot better.
Another way to do it is to flash the newest official KDZ for your model. You'll lose root and TWRP, but you can add those afterwards.
Click to expand...
Click to collapse
I'll go with SRKG2, but why do I need Dorimanx' kernel? How does it make it better? I'm sorry, I'm a little new to all of this

MrDavey said:
I'll go with SRKG2, but why do I need Dorimanx' kernel? How does it make it better? I'm sorry, I'm a little new to all of this
Click to expand...
Click to collapse
Dorimanx's kernel brings two advantages:
It has a lot of small optimizations that help the system run smoother.
It includes a settings app that you can use if you want to adjust anything. The defaults are good, so you don't really need to, but in case you e.g. want to change the compromise between speed and battery, the app is available.

TWRP on 5.0?

I've rooted my device and unlocked the bootloader, but I'm still confused about flashing TWRP; which version do I use? And will I need to back up my data w/ Titanium Backup first? Finally, what's the best way to flash ROMs in general? I'm on Lollipop (5.0), and OF1.

minusinfinityplusone said:
I've rooted my device and unlocked the bootloader, but I'm still confused about flashing TWRP; which version do I use?
Click to expand...
Click to collapse
https://dl.twrp.me/hltevzw/ (Note hltevzw)
Any of the 3.x...-4.4 series should work, but:
- AryaMod requires a 2.8.x series because of its use of the Aroma installer, see that thread for details
- Some "hlte" unified build ROMs that are compatible with the SM-N900V (hltevzw) won't install unless you use a hlte version of TWRP. (change the link above apropriately). Alternatively you can unzip the ROM file and delete the "assert" statement in the installer script, and rezip prior to installation. Pick your poison.
- Folks that are on really old bootloaders (e.g. MI9/MJ7/MJE) have to use the -4.3 variants because of differences in DTB hanlding.
minusinfinityplusone said:
And will I need to back up my data w/ Titanium Backup first?
Click to expand...
Click to collapse
Only if it is important to you.
minusinfinityplusone said:
Finally, what's the best way to flash ROMs in general?
Click to expand...
Click to collapse
Using TWRP.
.

why custom roms need magisk to work?

I want to know why because i never use root for Custom Roms in other devices

https://forum.xda-developers.com/mi...voidkernel-r1-android-8-0-beta-t3758768/page3
Read CosmicDan's Post ( i think its 4th one)

CosmicDan said:
Because our device uses skip_initramfs like the Pixels do (and apparently some other newer devices). This means that the initial rootfs exists on the system partition instead of the kernel ramdisk like classical devices.
The kernel ramdisk is only used for recovery. This is why the TWRP situation is not straightforward for us.
This is also why Magisk is required for some custom ROM's, because Magisk disables the system protection.
Sent from my Mi A1 using Tapatalk
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Click to collapse
Got the above response from here: https://forum.xda-developers.com/showpost.php?p=75777007&postcount=24