Update: 6.20 TN-B has been released. Total_Noob has updated his 6.20 TN CFW, here is the Changelog:
- Fixed homebrew execution crash on some PSPs (thanks to HacKmaN for debugging)
- Added PSP-3000 4g model support
- Resolved some important NIDs
- Added FAKE INDEX.DAT to TN VSH Menu.
- Dump whatever firmware with psardumper.
- Copy flash0:/vsh/etc/version.txt to ms0:/seplugins/version.txt.
- Enable the option and restart VSH, now your PSP version is faked.
- -> To downgrade just use a lower firmware EBOOT.