http://www.s1fw.com/plus/search.php?...e=titlekeyword
You'll have to try the display drivers from all of those firmwares which seem to match your screen #. Display drivers are the ui_*.drv files inside the firmware.
Procedure is here:
http://www.s1mp3.org/en/docs_advanceduguide.php
Summary:
- Extract all files of your current partially functional firmware. Keep a copy of the drivers and remember their filenames.
- Choose another firmware and extract the files of that firmware. Copy the display driver files over and make sure they have the same names as they were originally (e.g. replace ui_6b33l.drv with e.g. a ui_7515l.drv but rename it back to ui_6b33l.drv)
- Repack firmware into single file and flash it
- Repeat above steps until device works