I know a while back when i installed cm7 on my vibrant i had to do a lot of steps with clrad and flashing kernels one at a time... if i install with "rom manager" do i need to do any other step? does it change the kernel and everything for me already???
All ROMs have Kernels, otherwise they wouldn't work. If you want CM7 you can flash the latest Nightly using Rom Manager and aside from selecting to flash the gapps package too, there's no need to flash anything else.
Custom Kernels can be flashed from Recovery after the fact if you feel the need to try them.
Well, I'm a complete noob and I'm a bit confused. Consider this:
I flash the phone with CM7(say). Here I'm assuming that CyanogenMod comes with its own kernel. My question is: Can I flash a custom kernel on top of this setup? and what difference does it make?
One can also think the other way round. I have flashed my phone with a custom kernel. Successively I flash CM7 on to my phone. What happens then? Is the original custom kernel wiped out to be over-written by CM7 kernel? What can be done to keep it intact? Please people solve this dilemma...
saurabh.khare1000 said:
Well, I'm a complete noob and I'm a bit confused. Consider this:
I flash the phone with CM7(say). Here I'm assuming that CyanogenMod comes with its own kernel. My question is: Can I flash a custom kernel on top of this setup? and what difference does it make?
One can also think the other way round. I have flashed my phone with a custom kernel. Successively I flash CM7 on to my phone. What happens then? Is the original custom kernel wiped out to be over-written by CM7 kernel? What can be done to keep it intact? Please people solve this dilemma...
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If you wipe your data and system partitions on your phone and then flash a ROM you'll end up having that ROM's kernel.
Anytime you can flash another kernel over the default one. You might get some
advantages, but that depends on kernel's specifications. It might get you able to
increase more the frequency of your phone's CPU. There isn't necessarily an
advantage in flashing another kernel. ROM developers usually use to provide
the most stable kernel for their rom.
I'd like to remove the trinity Kernel for JellyBean. I enjoy it's overclock but I hate it when my phone just randomly reboots. Is there a way to remove it. I have created a backup before I flashed it, but I'd like to remove it without having to restore to that backup.
Thanks
flash your rom without wiping, then flash gapps
ej8989 said:
flash your rom without wiping, then flash gapps
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I should have mentioned, I'm running stock. No custom rom installed
Just flash a different custom kernel or the stock kernel. If you want a different custom kernel, and you want something stockish, you wan try SimpleKernel or thalamus kernel. As for the stock, I think you can find a flashable zip somewhere here in the NS forum.
I'm wondering if I have to flash a specific Kernel before flashing custom roms ( CM specifically ). My device is P3110 running stock 4.1.2 . Any help will be much appreciated, thanks guys.
Edit: Does flashing the CM Rom zip file flash the newest CM kernel or should I flash it manually?
kareemgonna said:
I'm wondering if I have to flash a specific Kernel before flashing custom roms ( CM specifically ). My device is P3110 running stock 4.1.2 . Any help will be much appreciated, thanks guys.
Edit: Does flashing the CM Rom zip file flash the newest CM kernel or should I flash it manually?
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Next blackhawx 1.8.3 developed ketut.kumayaja
kareemgonna said:
I'm wondering if I have to flash a specific Kernel before flashing custom roms ( CM specifically ). My device is P3110 running stock 4.1.2 . Any help will be much appreciated, thanks guys.
Edit: Does flashing the CM Rom zip file flash the newest CM kernel or should I flash it manually?
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Click to collapse
You never want to flash a kernel before flashing a rom because the rom will over write the kernel when it installs its own. If you want a custom kernel flash it right after flashing the rom.
All roms come with their own kernel.
Sent from your phone. You should be careful where you leave that thing.
Thanks
Skipjacks said:
You never want to flash a kernel before flashing a rom because the rom will over write the kernel when it installs its own. If you want a custom kernel flash it right after flashing the rom.
All roms come with their own kernel.
Sent from your phone. You should be careful where you leave that thing.
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That's exactly what I needed to know, I have another android device ( Xperia mini pro ) and every time I need to install a custom rom, I have to flash its kernel first. Here it seems like flashing the rom via recovery also flashes the kernel. Thanks for the help appreciated.
kareemgonna said:
I'm wondering if I have to flash a specific Kernel before flashing custom roms ( CM specifically ). My device is P3110 running stock 4.1.2 . Any help will be much appreciated, thanks guys.
Edit: Does flashing the CM Rom zip file flash the newest CM kernel or should I flash it manually?
Click to expand...
Click to collapse
The CM zip file has everything it needs. You just need to have a recovery ROM to be able to install CM from recovery. Additionally, you might want to reset various things from recovery before installing CM. Notice that if you reset the internal sdcard you will lose all your data (which might or might not be what you want).
I am about to flash my nexus 5 device.
I was wondering.. if i unlock the bootloader and install a custom recovery plus create a backup.. that means ill have basicly a backup on my phone of a factory ROM and kernel right ?
So If i play around with custom roms and Kernels does that mean if I want to go back to stock kernel or/and ROM I can just recover my backup files from ,for example, CWM ?
And also if anyone here knows... how big difference can a kernel for battery life extension make ?
Then..
If I want to flash both.. Custom ROM and Kernel.. Rom comes first ? And if after that .. lets say I have flashed Cyanogenmod , and I have decided to change ROMs , Do I have to flash factory ROM ? Or I can just factory reset and Flash ir over the Cyanogenmod ?
For example.. for elementalX kernel I read this line... "You should only flash ElementalX over the kernel that came with your ROM!!!" I assume that means I do flash the ROM first... and what if I want to change Kernels later on? I re-flash the factory kernel ? And how do I do that?
For now that would be it
Thanks
Yes, installing a custom recovery (I recommend TWRP) allows you to create a backup of the existing ROM for restoration at a later point in time if you don't like the phone's existing ROM. Restoring TWRP backups have always worked except for me except in a couple of situations where I could not boot the restored ROM without first doing a factory wipe of the data and cache partitions.
I can't comment on custom kernels except to say that everyone uses their phone in different ways and getting the best battery life and performance may require a lot of tweaking. You could just try different kernels to see which one suits your needs.
You can restore the ROM's original kernel by extracting the kernel from the original ROM and flashing it. Alternatively, you could dirty flash the over the existing ROM. For example, if you are running CM12.1 2015-12-30 with a custom kernel and you want to go back to CM12.1 2015-12-30 without the custom kernel, you could just re-flash the entire CM12.1 2015-12-30 ROM again.
audit13 said:
Yes, installing a custom recovery (I recommend TWRP) allows you to create a backup of the existing ROM for restoration at a later point in time if you don't like the phone's existing ROM. Restoring TWRP backups have always worked except for me except in a couple of situations where I could not boot the restored ROM without first doing a factory wipe of the data and cache partitions.
I can't comment on custom kernels except to say that everyone uses their phone in different ways and getting the best battery life and performance may require a lot of tweaking. You could just try different kernels to see which one suits your needs.
You can restore the ROM's original kernel by extracting the kernel from the original ROM and flashing it. Alternatively, you could dirty flash the over the existing ROM. For example, if you are running CM12.1 2015-12-30 with a custom kernel and you want to go back to CM12.1 2015-12-30 without the custom kernel, you could just re-flash the entire CM12.1 2015-12-30 ROM again.
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Thanks!
What advantages does TWRP has over CWM ? And also does it recover other files as well or just the system ones ?
And I guess its safer to just extract the original ROMs kernel.. Just how do i do that ?
TWRP is well supported and features a simple touch interface. TWRP will recover the system and data files.
Not necessarily safer to flash just the kernel rather than the entire ROM. It also saves time and effort because, if the kernel is not extracted and compiled for flashing in recovery, it could cause the phone to bootloop.
I've never extracted the kernel myself but this may help: https://www.youtube.com/watch?v=rLhprnOF6-U
audit13 said:
TWRP is well supported and features a simple touch interface. TWRP will recover the system and data files.
Not necessarily safer to flash just the kernel rather than the entire ROM. It also saves time and effort because, if the kernel is not extracted and compiled for flashing in recovery, it could cause the phone to bootloop.
I've never extracted the kernel myself but this may help:
Click to expand...
Click to collapse
Thanks!
So.. If, lets say, I flash cyanogenmod. Then Flash custom kernel. In order to change other kernel which is also custom , I should first flash the factory ROM which will have kernel on it ? And then reflash the ROM and then flash the new kernel ?
Im sorry , I also read a lot about this and somewhere on the way got really confused , haha.
Let's assume you flash CM version 1 and then you flash custom kernel "Kernel A". If you want to try another custom kernel named "Kernel B", you could just flash "Kernel B" over "Kernel A". If the developer of "Kernel B" cays it must be flashed over CM's original kernal, you could still flash "Kernel B" over "Kernel A" and hope it works. If it doesn't work, you could dirty flash CM version 1 over the existing ROM, then flash "Kernel B".
audit13 said:
Let's assume you flash CM version 1 and then you flash custom kernel "Kernel A". If you want to try another custom kernel named "Kernel B", you could just flash "Kernel B" over "Kernel A". If the developer of "Kernel B" cays it must be flashed over CM's original kernal, you could still flash "Kernel B" over "Kernel A" and hope it works. If it doesn't work, you could dirty flash CM version 1 over the existing ROM, then flash "Kernel B".
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Thank you. Made things much clearer. Dirty flash means just flashing over the existing custom ROM and Kernel right?
And also.. What about if i have CM and Kernel B ... But i want to go change to ParanoidAndroid and still keep the Kernel B? This ROM would remove the Kernel and I would have to re flash ir right?
And also if I am just switching around ROMs only.. I can just flash them one over another? Perhaps a factory reset is healthy in between though.
Dirty flash means flashing over the existing ROM without wiping the system in recovery.
Flashing any ROM over an existing ROM will replace the system and kernel. If you want to change ROMs altogether, you'd flash PA and then flash Kernel B.
When changing ROMs, I always recommend a full wipe (i.e. system, data, cache).
audit13 said:
Dirty flash means flashing over the existing ROM without wiping the system in recovery.
Flashing any ROM over an existing ROM will replace the system and kernel. If you want to change ROMs altogether, you'd flash PA and then flash Kernel B.
When changing ROMs, I always recommend a full wipe (i.e. system, data, cache).
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Alright. And just one last thing that I got a bit confused of..
When I root and install a custom ROM, I am not going to receive OTAs. If I just flash the newest custom ROM does that work as an update? Or the newest ROM can ble flashed over the newest android? If so... How do I exactly get the newest updates manually? I have to flash to factory ROM and then somehow flash the update? By far thats how I understood it.
rihz said:
Alright. And just one last thing that I got a bit confused of..
When I root and install a custom ROM, I am not going to receive OTAs. If I just flash the newest custom ROM does that work as an update? Or the newest ROM can ble flashed over the newest android? If so... How do I exactly get the newest updates manually? I have to flash to factory ROM and then somehow flash the update? By far thats how I understood it.
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Click to collapse
Depends on which rom, but updates to custom roms generally can just be flashed over. Not sure of the MM jump, but from KK to LP, it worked fine so far. Whatever you do read the instructions of the rom and kernel builders. You get lucky sometimes and can dirty flash things that should not be dirty flashed, but if there are issues, there are instructions on the rom or kernel page how to start again.
If you are factory modified and want a factory image you need to flash in fastboot. If on a custom rom, well, like I said follow their advice. Make sure to backup with recovery and save on computer before doing anything.
wangdaning said:
Depends on which rom, but updates to custom roms generally can just be flashed over. Not sure of the MM jump, but from KK to LP, it worked fine so far. Whatever you do read the instructions of the rom and kernel builders. You get lucky sometimes and can dirty flash things that should not be dirty flashed, but if there are issues, there are instructions on the rom or kernel page how to start again.
If you are factory modified and want a factory image you need to flash in fastboot. If on a custom rom, well, like I said follow their advice. Make sure to backup with recovery and save on computer before doing anything.
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Okay, thanks!
And Happy New year to you all!