Hi kunix,
This is my last Nuvi 255w with White screen to test, I am afraid if I reboot it, it will no longer Power ON again like the previous one.
I have attempt to do the Region 5 and 43, because I read your other post and told that 'maybe the screen is white because the LCD is unknown to the bootloader?",
that's why I tried to get the region 5 and 43 from working Nuvi 255W same HWID, attempt to overwrite the Region 5 and 43, and hopefully it can solve the white screen problem,
would like to add that both Nuvi 255w can be access Mass storage mode and preboot mode and also boot as normal, just only the screen is total white, unable to see anything, since this 2 Nuvi with me already got some time, and I think no hope to recover, I am trying whatever method, no matter what and prepare to make it dead.