Database Users

Custom kernel queries

Hi there, just want to begin by saying how amazing this community is. I'm new to whole Android scene (just came over from iOS) but what a welcome it has been! I'm blown away by the amount of ways you can customize your Nexus 7, really puts the iPad to shame
So I've rooted my Nexus 7 and am now hoping to install a custom kernel...however I have quite a few questions pertaining to this procedure.
1) How do I install a custom kernel (ie Trinity)?
2) I'm looking to improve battery life without compromising performance, what kernel would you recommend for this?
3) Can I still get OTA if I have a custom kernel?
4) Can I revert back to stock kernel and if so, how do I do this?
Sorry to come across as a newb, I saw a lot of helpful threads on custom ROMs however I found the stuff on kernels a bit daunting...Hopefully this thread will be helpful for others as well
Thanks again everyone.
Sent from my Nexus 7 using xda app-developers app

1. just flash it in recovery, dont wipe a thing.
2. trinity
3. kernels dont have anything to do with ota. if its still enabled in your rom then yes.
4. either fastboot flash a stock boot.img or just reflash your rom without wiping anything.
5.

Worth noting that when a new rom is installed it installs its own kernel so you'll have to reflash your kernel.
I also recommend faux for good battery life. Both that and Trinity are good.
Sent from my LG-P999 using xda app-developers app

Should i modify it?

Hi, i'm a little bit scared about modifying it. Is there a real big difference in performance between the stock rom and a custom with a kernel at stock frequencies? And i've seen a lot of methods about unlocking/rooting it, but i am scared if i brick it... Is there a 100% safe method to unlock and root it? And i've heard about a problem with the buggy stock recovery, will i have this problem if i flash cwm?
Sorry for the huge number of questions and for my bad english
Sent from my Nexus 7 using xda app-developers app

Personally I found that there is not a great deal of difference between stock ROM and many of the custom ROMs out there. For me it is more to do with having the freedom to get tore into the tablet.
There is never a 100% guarantee that yo won't mess up when rooting and installing custom software, however the vast majority of users on here have managed to do it safely with the tools available.
If you are going down the path of rooting and customs, may I suggest you give the team EOS ROM a try coupled with Franco kernel. They work together like a dream. Also paranoid android ROM for something different . Though I found it to be a little slow for my liking.
Finally clemsyns elite kernel if you want crazy performance, but it does eat the battery
Sent from my Nexus 7 using Tapatalk 2

Rooting is quite painless and reasonably safe if you follow the directions closely. The one click rooting methods, elsewhere in this forum...work well.
Myself, I prefer the stock rom. The custom roms might offer better performance, but can be buggy at times. although. I do switch back and forth to try them out. Remember, these roms
are all works in progress, so do not be surprised if something does not work the way you think
it should.

Thanks for the answers. I'm thinking about only rooting it. Will i receive the ota for a new update?
Sent from my Nexus 7 using xda app-developers app

As long as you keep the stock recovery you can keep doing ota updates
Sent from my HTC One X using xda app-developers app

In my experience, OTA never worked to well.. but there are ways around it, for example... backing up your apps, then load a fresh updated factory image. then just restore your apps..
Titanium backup is one such app, but there are others .

So far no matter what I try I cant brick it oh I can get it stuck but theres always a way to fix it. And like some others here I have tried I believe every ROM out there. Not one really stands out "different" for ME then any other. Nexus root toolkit is by far the easiest to use for me. If your into battery life so far Stock wins hands down.

Unlocking and rooting the Nexus is really simple and pretty much foolproof. I'll admit there isn't that much of a difference between stock and custom ROMs because the N7 with JB is already a beast. I just like custom ROMs because you have the ability to make it faster if you want to (I have my CPU over clocked by 500 MHz and my GPU over clocked by 300 MHz thanks to clemsyn's elite kernel) the only reasons why I wanted to put a custom ROM on this was because I missed the 3 in 1 shutdown menu and the ability to remove the notification shae toggles, other than that I don't mess with much because JB is already buttery smooth. Gone are the days when you have to root, OC and install custom ROMs just to get good performance out of your device like I had to do with the OG droid.

I would definitely at least root the device for the time being. Aside from some customization options in a few custom ROMs I actually really enjoy stock on my N7... I would also take a look at ... http://forum.xda-developers.com/showthread.php?t=1905961 once you have it all ready to go... I found it made an improvement to my Wifi and GPS by a fair bit, no custom rom needed.

Most stable custom ROM with kernel?

Hi all. I am a proud owner of a 32gb wifi Nexus 7. While not new to Android, this is my 1st tablet. Love the size, weight and most of all...is android!
My question is, what combination of ROM with kernel would be best? I know there are a lot of things to consider, but I am looking for opinions only. Without talking down certain ROMs and/or kernels, we can share here opinions based on stability, customization and smoothness! I already encounter an issue when I rooted my 2 days brand new N7 rooting it with the Tool kit. Rooted it fast and easy (successfully), but installed TWRP. Me knowing no better, I love and I'm used to CWM, so I installed ROM Manager and CWM. Long story short, when I went to flash one ROM in particular, in recovery, when I formated system, data reset, wiped cache & dalvik, it wiped my sdcard clean. I mean, thats how I flash my Note 2 for a clean install and never had an issue like that. Then, when I tried to get into recovery via fastboot, I couldn't. It was like CWM wasn't there.
Thanks to the Tool Kit, I was able to un root and go back to stock....then rooted again (with TWRP) and finally flashed CM-10 stable. Also flashed faux's 4.1.2 kernel @ 1600. I like what I have so far, but I would like something more. I got the stable CM-10 from the actual CM thread so the ROM is pretty much untouched.
Can anybody please share what ROM and kernel I should try for a bit of stability, power and smothness at the same time? Any inputs and/or advice, will be greatly appreciated!

Try Paranoidandroid as a ROM. And i think the kernel that comes with it is the smoothest i have used with it.
Sent from my Nexus 7 using Tapatalk HD

Wally72 said:
Hi all. I am a proud owner of a 32gb wifi Nexus 7. While not new to Android, this is my 1st tablet. Love the size, weight and most of all...is android!
My question is, what combination of ROM with kernel would be best? I know there are a lot of things to consider, but I am looking for opinions only. Without talking down certain ROMs and/or kernels, we can share here opinions based on stability, customization and smoothness! I already encounter an issue when I rooted my 2 days brand new N7 rooting it with the Tool kit. Rooted it fast and easy (successfully), but installed TWRP. Me knowing no better, I love and I'm used to CWM, so I installed ROM Manager and CWM. Long story short, when I went to flash one ROM in particular, in recovery, when I formated system, data reset, wiped cache & dalvik, it wiped my sdcard clean. I mean, thats how I flash my Note 2 for a clean install and never had an issue like that. Then, when I tried to get into recovery via fastboot, I couldn't. It was like CWM wasn't there.
Thanks to the Tool Kit, I was able to un root and go back to stock....then rooted again (with TWRP) and finally flashed CM-10 stable. Also flashed faux's 4.1.2 kernel @ 1600. I like what I have so far, but I would like something more. I got the stable CM-10 from the actual CM thread so the ROM is pretty much untouched.
Can anybody please share what ROM and kernel I should try for a bit of stability, power and smothness at the same time? Any inputs and/or advice, will be greatly appreciated!
Click to expand...
Click to collapse
Hi, Wally72...
I don't know if this question can be answered objectively... it all hinges on how you intend to use the device, day to day. If your going to be playing high-octane video games, then a kernel that supports overclocking would be advised... but that will come at a battery life cost. More CPU cycles = battery drain.
For myself, I am currently running PaulOBriens MoDaCo custom ROM (can't post links yet, but Google MoDaCo Nexus7, and you should find it)...
The standard MoDaCo ROM for the N7 doesn't go too far off stock... it just adds some really nice features... AOSP browser (better than Chrome IMHO), expanded powerdown menu, Adobe Flash Player in /system (although Adobe no longer support it, it's still useful to have).
Paul has recently ventured into CyanogenMod territory with CM10.1 unofficial nightlies... which he has stated will be released every Friday.
And this is what I'm running now - MoDaCo CyanogenMod Custom ROM r3 - and in conjunction with Franco's r39 kernel, it's incredibly smooth... and very respectible battery performance as well.
Hope this is of some use...
Rgrds,
Ged.

stock
stock is stable

vital982 said:
stock is stable
Click to expand...
Click to collapse
stock if u want a tabui try smoothrom with franco kernel

[Q] How safe is it to flash cm10 on the Nexus 4?

Hello, im new on xda, and i really want to make a thread.
I currently have a 16GB Nexus 4 and im not sure about have safe it is to flash a new rom and kernel, and do i need to take a backup/recovery of the stock rom and kernel? (Sorry for my English, im from Denmark)
And if i decide to install fx. cyanogenmod 10 on my Nexus 4 which Kernel is the best to install?
(Im really noob to rooting and that kind of things )
Hope you will answer my question.

FR4NS3N said:
Hello, im new on xda, and i really want to make a thread.
I currently have a 16GB Nexus 4 and im not sure about have safe it is to flash a new rom and kernel, and do i need to take a backup/recovery of the stock rom and kernel? (Sorry for my English, im from Denmark)
And if i decide to install fx. cyanogenmod 10 on my Nexus 4 which Kernel is the best to install?
(Im really noob to rooting and that kind of things )
Hope you will answer my question.
Click to expand...
Click to collapse
You should always backup before flashing.
The kernel you use is up to you. People who ask which is the best tend to have their threads locked.

It is safe.
First you will have to unlock your bootloader. And then flash a recovery.
Backup your current rom.
Wipe.
Flash.
Sent from my Nexus 4 using xda app-developers app

Very safe.
If you are new to flashing and custom android in general I recommend sticking to the kernel whatever ROM you choose comes with. The more complex you make things the more chances you can make a mistake; for example, there are several people who have bricked their Nexus 4s by flashing kernels for the N7 etc. Also, depending on the kernel, you may introduce the possibility for instability or worse, cause damage to your phone. Do lots of research before playing with any custom kernels and make sure you are flashing the correct kernel for your device (mako).
As far as CM10.1 Nightlies go, they are extremely stable and can have minor bugs occasionally when new features are introduced. Stick to one of the M builds if you want to play it safe. Stable builds of CM10.1 have not yet arrived for any devices, but I have a feeling we're not too far off.

Been flashing CM nightlies everytime I charge my phone and haven't run into any issues yet. The ROM itself feels just as smooth as stock with the added bonus of extra features and customization. I think it's perfectly safe as long as you don't accidentally flash something meant for another device

[Q] Need some help, not sure where to find these answers.

I'll start off by giving some background information. I ordered my Nexus 4 back in March and ran stock up until about July/June. Prior to the Nexus I had the HTC G2. I don't know how to root and and use custom ROMs and I have looked at the root guide for the Nexus but it's a huge barrage of information and some terms that I don't know what they are. However, this question doesn't involve rooting. I gave my Nexus 4 to a friend, who also has the Nexus, to root for me and use a custom ROM. In this process however, he did something that he told me to never do (I really don't know why..) and he ended up soft bricking my phone. He did that because my phone was stuck on the "Google" start up screen for over 40 minutes. Basically, he wiped the entire phone, I think. Due to some issues, we are no longer on speaking terms and he was the only person I knew who knows how to deal with rooting and custom ROMs.
Now I don't have the original back up of the stock. My question is, if I ever needed to send my phone back to Google for repairs or anything else, would I be able to somehow get the phone back to it's stock state?
Also, where could I find some resources that aren't a barrage of information? When I go to those threads like the Nexus rooting guide, it's just so much information and I get lost (I don't even quite know what a ROM is, my current interpretation is an operating system). Currently, I think I know how to update the ROM, I'm currently using Paranoid Android.
I apologize if this issue of mine can easily be solved with a search. I have googled this issue numerous times and I could not really find a solid answer.

Fubs261 said:
I'll start off by giving some background information. I ordered my Nexus 4 back in March and ran stock up until about July/June. Prior to the Nexus I had the HTC G2. I don't know how to root and and use custom ROMs and I have looked at the root guide for the Nexus but it's a huge barrage of information and some terms that I don't know what they are. However, this question doesn't involve rooting. I gave my Nexus 4 to a friend, who also has the Nexus, to root for me and use a custom ROM. In this process however, he did something that he told me to never do (I really don't know why..) and he ended up soft bricking my phone. He did that because my phone was stuck on the "Google" start up screen for over 40 minutes. Basically, he wiped the entire phone, I think. Due to some issues, we are no longer on speaking terms and he was the only person I knew who knows how to deal with rooting and custom ROMs.
Now I don't have the original back up of the stock. My question is, if I ever needed to send my phone back to Google for repairs or anything else, would I be able to somehow get the phone back to it's stock state?
Also, where could I find some resources that aren't a barrage of information? When I go to those threads like the Nexus rooting guide, it's just so much information and I get lost (I don't even quite know what a ROM is, my current interpretation is an operating system). Currently, I think I know how to update the ROM, I'm currently using Paranoid Android.
I apologize if this issue of mine can easily be solved with a search. I have googled this issue numerous times and I could not really find a solid answer.
Click to expand...
Click to collapse
Is the phone booting into PA? If not try holding the power button and the volume down at the same time. It should boot into recovery. If it does all you need to do is flash a rom "install a os".
Sent from my Nexus 4 using xda app-developers app

Tunderpimp said:
Is the phone booting into PA? If not try holding the power button and the volume down at the same time. It should boot into recovery. If it does all you need to do is flash a rom "install a os".
Sent from my Nexus 4 using xda app-developers app
Click to expand...
Click to collapse
Ohh yes, I should clarify. Currently the phone is working and I have it up to date on Paranoid Android. The only issue I had when updating Paranoid Android was that I could not use the kernel my friend had supplied me with (I think it was the Franco kernel). When I would flash the kernel, it would get stuck on the Google logo screen. I would have to get out of that by re-flashing Paranoid Android again and I've been unsuccessful in flashing any kernels. The main reason I wanted to root my phone was a custom kernel, to help with battery life.
My main question is that I wanted to know if I could ever get it back to stock (as to not void a warranty) if I were to ever need to for any reason.

Fubs261 said:
Ohh yes, I should clarify. Currently the phone is working and I have it up to date on Paranoid Android. The only issue I had when updating Paranoid Android was that I could not use the kernel my friend had supplied me with (I think it was the Franco kernel). When I would flash the kernel, it would get stuck on the Google logo screen. I would have to get out of that by re-flashing Paranoid Android again and I've been unsuccessful in flashing any kernels. The main reason I wanted to root my phone was a custom kernel, to help with battery life.
My main question is that I wanted to know if I could ever get it back to stock (as to not void a warranty) if I were to ever need to for any reason.
Click to expand...
Click to collapse
which franco kernel, was it compatibke with your rom? i mean are you on android 4.3 and the kernel 4.2.2(or vice versa)? when you flashed the kernel, did you flash with the rom then boot up, or did you just flash the kernel alone? did you try redownloading the kernel, maybe a bad download? was it a jss kernel or a jwr kernel?

Fubs261 said:
My main question is that I wanted to know if I could ever get it back to stock (as to not void a warranty) if I were to ever need to for any reason.
Click to expand...
Click to collapse
Yes you can.
Read the guides as slowly as you need to...stopping to research anything you don't understand...
Or just use those no brainer toolkits that teach you nothing.
And stick to stock until you know what's going on within your device when you do these things.

simms22 said:
which franco kernel, was it compatibke with your rom? i mean are you on android 4.3 and the kernel 4.2.2(or vice versa)? when you flashed the kernel, did you flash with the rom then boot up, or did you just flash the kernel alone? did you try redownloading the kernel, maybe a bad download? was it a jss kernel or a jwr kernel?
Click to expand...
Click to collapse
I'm not sure what version it was, I guess that might have been the issue. Would that have caused it to stay on the Google logo screen? I'll make sure to double check for that next time I try to do something.
studacris said:
Yes you can.
Read the guides as slowly as you need to...stopping to research anything you don't understand...
Or just use those no brainer toolkits that teach you nothing.
And stick to stock until you know what's going on within your device when you do these things.
Click to expand...
Click to collapse
Thank you for answering. Could you link a good starter thread for me? I was hesitant to use a custom ROM or even to root my phone. What compelled me to do it was the kernels extending battery life. Because I was so lost and felt overwhelmed, I had my friend help me but now we are no longer on talking terms so I'm lost.
Again, I wish to apologize, I know I should just look this up myself, but with the possibility of bricking/soft-bricking my phone, I want to get as much help as possible. Whatever small nudge, I will take.

Your questions can be answered by reading the stickies thread in the general section. Just follow the instructions to flash back to factory stock:
http://forum.xda-developers.com/showthread.php?t=2010312
If you flash a kernel and the phone won't boot, that kernel or version of the kernel isn't compatible with that rom or particular version of Android.
sent from xda premium app
---------- Post added at 06:09 AM ---------- Previous post was at 06:06 AM ----------
Fubs261 said:
Because I was so lost and felt overwhelmed, I had my friend help me but now we are no longer on talking terms so I'm lost.
Click to expand...
Click to collapse
I hope it's not because he messed up your phone, it's not his fault that you trusted him to do it in the first place. If not, well nevermind.
sent from xda premium app

It's very simple to get it back to stock. You'd just need to find a copy of the stock Rom (which I can assure you is probably on this very website floating around somewhere) and flash it in recovery like you would any other Rom.
Sent from my 16GB Blue Verizon Galaxy S3 running MIUI v5 with KT kernel
---------- Post added at 03:14 AM ---------- Previous post was at 03:12 AM ----------
Also keep in mind, custom roms usually come with custom kernels. So you shouldn't even have to worry about kernel flashing. If you want to preserve battery you should focus more on under clocking and thermal throttling...
You can find guides on here somewhere for that too...
Sent from my 16GB Blue Verizon Galaxy S3 running MIUI v5 with KT kernel