Splash image partition format (8110 4G and probably other 240x320 KaiOS phones)

[Luxferre]

OK, I finally got the format of the splash partition (the one that displays 'Powered by KaiOS' by default), it's quite simple, I think this can be given away for now how to create it without obscure scripts (duplicating from Discord channel):

• First 8 bytes (0 to 7): SPLASH!! (or 53 50 4C 41 53 48 21 21 in hex)
  
• Bytes 8 to 11: 32-bit width, little-endian (for 8110: f0 00 00 00, equals to 240)
  
• Bytes 12 to 15: 32-bit height, little-endian (for 8110: 40 01 00 00, equals to 320)
  
• Bytes 16 to 19: 32-bit image type, little-endian (for 8110: 00 00 00 00)
  
• Bytes 20 to 23: 32-bit 512-block count, little endian (for 8110: 2c 01 00 00, equals to 240x320x2/512 = 300)
  
• Next 488 bytes: zero-filled
  
• Bytes from 512: raw 16-bit image data in BGR565LE format
  

The ready-made header file (logohdr.bin) is attached.

The BGR565LE images can be created from PNG with this command:

ffmpeg -vcodec png -i input_logo.png -vcodec rawvideo -f rawvideo -pix_fmt bgr565 -s 240x320 -y bgr_logo.bin

Then just use cat to join the header:

cat logohdr.bin bgrlogo.bin > splash.img

And the image can then be overwritten to splash partition.

Enjoy!

[speeduploop]

The Nokia 8110 seems to be able to render animations --> https://garbsch.eu/posts/updating-bootlogo-and-bootanimation-for-nokia-8110-4g/

[Luxferre]

Bootanimation.zip is another story. This guide is for the initial kernel splash screen which must be static.

[PuriShnit]

Bootanimation.zip can easily be customized. --> standard Android bootanimation...

(.zip must not be compressed at all, otherwise won't work).

[Dhruv Sharma]

For updating the bootanimation, can I simply replace bootanimation.zip?

[Nayam Amarshe]

Great work!

[speeduploop]

...had to link it here...

;)

[Dhruv Sharma]

 How do I overwrite the splash partition?

[PuriShnit]

With 'dd' command.

Is your phone rooted, or you have recovery with test-keys?

On 24 January 2019 12:37:45 pm Dhruv Sharma <dhruv.sh...@gmail.com> wrote:

 How do I overwrite the splash partition?

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[Dhruv Sharma]

My phone is rooted

On Thursday, January 24, 2019 at 7:20:31 PM UTC+5:30, PuriShnit wrote:

With 'dd' command.

Is your phone rooted, or you have recovery with test-keys?

On 24 January 2019 12:37:45 pm Dhruv Sharma <dhruv.sh...@gmail.com> wrote:

 How do I overwrite the splash partition?

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[Dhruv Sharma]

Can someone help me? I have the splash.img partition ready. I do not know how to overwrite it on my rooted device.

[PuriShnit]

So copy the splash.img to your SD card & insert in the phone.

Or push with adb to /data/local/tmp/

Then, (example if placed in the root of your SD card):

adb shell
busybox telnet localhost
dd if=/sdcard/splash.img of=/dev/block/bootdevice/by-name/splash
reboot

Now you should see your phone booting with your custom splash screen...

Enjoy!

On 24 January 2019 2:57:09 pm Dhruv Sharma <dhruv.sh...@gmail.com> wrote:

Can someone help me? I have the splash.img partition ready. I do not know how to overwrite it on my rooted device.

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[Dhruv Sharma]

Thanks it worked

On Thursday, January 24, 2019 at 8:39:43 PM UTC+5:30, PuriShnit wrote:

So copy the splash.img to your SD card & insert in the phone.

Or push with adb to /data/local/tmp/

Then, (example if placed in the root of your SD card):

adb shell
busybox telnet localhost
dd if=/sdcard/splash.img of=/dev/block/bootdevice/by-name/splash
reboot

Now you should see your phone booting with your custom splash screen...

Enjoy!

On 24 January 2019 2:57:09 pm Dhruv Sharma <dhruv.sh...@gmail.com> wrote:

Can someone help me? I have the splash.img partition ready. I do not know how to overwrite it on my rooted device.

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