boot splash screen

[Fra]

Good Mornig you all,
I've flashed and SD card with Debian bullseye minimal to use with A20 Lime and Lime2.
I would like to change the boot splash screen, so i have followed this discussion at the link:
https://www.olimex.com/forum/index.php?topic=3066.15#quickreply_anchor
but it doesen't work.
Has anybody done it ?

Can you help me please?
Thanks