Pulling a kernel from a ROM zip

[dante32278]

Howdy, I just tried an AOSP ROM on my gs3 and wanted to try the Bleeding Edge kernel. In case it doesn't work or I want to go back to stock, how do I go about putting the ROMs included kernel back on the phone without doing a dirty flash of the ROM?

Sent from my SPH-L710 using Tapatalk 2

 

[CNexus]

You can do this (using adb) after pulling the boot.img from your current roms zip.

adb push boot.img /sdcard/boot.img
adb shell 
$ su 
# dd if=/sdcard/boot.img of=/dev/block/mmcblk0p7

Reboot and your old kernel will be back.

 

[dante32278]

Thanks, never used adb but I can download and the commands seem pretty simple. I bet you also know how to make it into a flashable zip?

Sent from my SPH-L710 using Tapatalk 2

 

[CNexus]

Thanks, never used adb but I can download and the commands seem pretty simple. I bet you also know how to make it into a flashable zip?

Sent from my SPH-L710 using Tapatalk 2

YUP

Take your rom.zip and extract ONLY the META-INF folder and boot.img

Open the "updater-script" file with a text editor and delete everything

Now type the following line, and then make sure to leave 1 line blank after it

package_extract_file("boot.img", "/dev/block/mmcblk0p7");
<blank line here>

Then save it (make sure no extension gets added) and zip up the META-INF folder and boot.img.

The zip should look like this

Inside restoreKernel.zip
---META-INF
---boot.img

Congrats! You just made a universal kernel flasher. If you want to flash any other kernel for your device now (same android version and all that, of course), just swap out the boot.img in the zip and flash away

 

[dante32278]

YUP

Take your rom.zip and extract ONLY the META-INF folder and boot.img

Open the "updater-script" file with a text editor and delete everything

Now type the following line, and then make sure to leave 1 line blank after it

package_extract_file("boot.img", "/dev/block/mmcblk0p7");
<blank line here>

Then save it (make sure no extension gets added) and zip up the META-INF folder and boot.img.

The zip should look like this

Inside restoreKernel.zip
---META-INF
---boot.img

Congrats! You just made a universal kernel flasher. If you want to flash any other kernel for your device now (same android version and all that, of course), just swap out the boot.img in the zip and flash away

Sent from my SPH-L710 using Tapatalk 2

 

[dimigeo1996]

Sent from my SPH-L710 using Tapatalk 2

Will this process work on my Ace II ?

 

[CNexus]

Will this process work on my Ace II ?

You would need to change the partition it flashes the boot.img to (the /dev/block/mmcblk0p7 part)

But other than that, it should