Try this:
- create a bmp file (as RGB, 24 bits) with the same resolution as your device
- save it as logo.bmp in the root of the SD card
- copy it also as 912c.img, (again, in the root of the SD card)
- put the SD card in the device and reboot it (or simply turn it on if it was off), it should show a blue screen and telling it's loading the new image
- once done, remove those files from the root of the SD card, otherwise it will change the image at every boot.
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