fully functional, but no display
 

My one should be 9.0.50, but I used 9.0.48 1.5inch for there is no 9.0.50 for 1.5inch. However, after being updated with 9.0.48, it gives mp3, radio...functions back despite the screen is blue.

It was so close to have it fully recovered. Please give me some ideas.

Cheers.

zoo , if you had exhausted all the v9.0.xx firmwares in the downloads section, then you're pretty much left with no other choice but to wait until the firmware extraction tool is able to support your version.

Try searching the CD that came with your player, sometimes the firmware is in it. It should be in .bin or .fw extension.

Also, you can try contacting your seller and see if they have any firmware for your player to send to you.