Some guy known as tinman found a way to use 3.90 features on your 3.80 M33-5 PSP.
Warning:MAKE SURE YOU HAVE A PANDORA BATTERY READY. Just to be secure.
1. Install 3.90
2. Enter service mode with a working elf menu and PRX's needed for flash access.
3. Backup flash0 from 3.90 to your PC.
4. Install 3.80-5 via DC4 M33.
5. Enter service mode.
6. Access flash0 copy everything from your 3.90 backup over 3.80 M33-5.
Tested homebrew, ISO's, skype, recovery menu, and M33 VSH menu. Many plug-ins do not work, POPS is untested. System crashes when entering the setting menu > game menu.
This works because the homebrew enabled IPL works with 3.90, well mostly.
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