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How to replace custom kernel?

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Renecek
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Default How to replace custom kernel?

Hello, using Purity ROM + Semaphore kernel and I want to try another kernel. Maybe matr1x. What are steps? I need to flash stock kernel, than custom or I can flash custom kernel without stock?

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DrFredPhD
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You don't have to flash stock first.
 
Mashed_Potatoes
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Just flash custom over custom...no need to flash stock
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Mr_JMM
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Originally Posted by DrFredPhD View Post
You don't have to flash stock first.
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Originally Posted by Mashed_Potatoes View Post
Just flash custom over custom...no need to flash stock
Use caution. There are cases where flashing one kernel over another has proven to cause stability issues. Whilst for the majority of cases it's not necessary to flash stock kernel first, be prepared to do so. In other words, have a stock kernel downloaded as a back up in case you do have issues with the phone after the kernel exchange.
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Current Devices: Nexus 4 / Nexus 7
Nexus 4: Stock Android 4.4.2 / CyanogenMod 11 M5
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Recovery: TWRP (MultiRom) 2.7.0.0 | Kernel: hells-Core B46 T4 | Radio: Stock .98 | Runtime: ART
- - - - - - - - - - -
Nexus 7: Stock Android 4.4.2 / Ubuntu Touch
(Dual Boot)
Recovery: TWRP (MultiRom) 2.7.0.0 | Kernel: Stock | Runtime: Dalvik

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Mashed_Potatoes
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Originally Posted by Mr_JMM View Post
Use caution. There are cases where flashing one kernel over another has proven to cause stability issues. Whilst for the majority of cases it's not necessary to flash stock kernel first, be prepared to do so. In other words, have a stock kernel downloaded as a back up in case you do have issues with the phone after the kernel exchange.
I've been flashing custom over custom on my ex-Note II and everything was fine. And of course, always wipe cache
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Mr_JMM
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I've been flashing custom over custom on my ex-Note II and everything was fine. And of course, always wipe cache
Good for you. Still doesn't mean the best advice we can give someone here is to "don't worry about it, just do it, it'll be fine". You don't know what ROM / Kernel people are coming from / going to and you certainly don't know how future ROMs / Kernels will behave. Again, there ARE examples on this forum where some kernels don't like being flashed over other non-stock kernels, problems have arisen and the only option was to flash a stock kernel first.

The best advice we can give someone on this forum is to be prepared for something to not go 100%. Like you I've never had a bad flash be-it ROM, radio or kernel but I still make sure I have a nandroid of the previous working state, stock ROM, radio and Kernel downloaded and know how to flash them before I do anything. That way, should it go wrong I'm covered.

I can not stress enough how wrong it is to just say "yeah, nothing will go wrong". It DOES go wrong and it goes wrong every day. For someone.
Useful Links: XDA's Best Kept Secret | Free Beer!! | The Answer | XDA TV

Current Devices: Nexus 4 / Nexus 7
Nexus 4: Stock Android 4.4.2 / CyanogenMod 11 M5
(Dual Boot)
Recovery: TWRP (MultiRom) 2.7.0.0 | Kernel: hells-Core B46 T4 | Radio: Stock .98 | Runtime: ART
- - - - - - - - - - -
Nexus 7: Stock Android 4.4.2 / Ubuntu Touch
(Dual Boot)
Recovery: TWRP (MultiRom) 2.7.0.0 | Kernel: Stock | Runtime: Dalvik

I come, I f**k sh!t up, I leave
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Mashed_Potatoes
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Quote:
Originally Posted by Mr_JMM View Post
Good for you. Still doesn't mean the best advice we can give someone here is to "don't worry about it, just do it, it'll be fine". You don't know what ROM / Kernel people are coming from / going to and you certainly don't know how future ROMs / Kernels will behave. Again, there ARE examples on this forum where some kernels don't like being flashed over other non-stock kernels, problems have arisen and the only option was to flash a stock kernel first.

The best advice we can give someone on this forum is to be prepared for something to not go 100%. Like you I've never had a bad flash be-it ROM, radio or kernel but I still make sure I have a nandroid of the previous working state, stock ROM, radio and Kernel downloaded and know how to flash them before I do anything. That way, should it go wrong I'm covered.

I can not stress enough how wrong it is to just say "yeah, nothing will go wrong". It DOES go wrong and it goes wrong every day. For someone.
Umm, a recovery backup is something everyone should have. A backup of everything, including EFS for the clumsy ones that lose their IMEI's.

If you have a full backup of your system, it is okay to say "don't worry everything will be alright". If something goes wrong, you just do a system restore.

But that's just me, i can't be bothered with flashing stock kernels and roms all the time.

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