6.20 TN-B / Homebrew Enabler (HEN) is released. TN HEN allows you to execute homebrews and plugins. It includes a TN VSH Menu for some nifty features. It's similar to the Custom Firmware - without ISO/CSO and PSX support.

This is because you have a 4G model. TN-B will support 4g

6.20 TN-B Changelog:
- Fixed homebrew execution crash on some PSPs (thanks to HacKmaN for debugging)
- Added 4g model support
- Resolved some important NIDs
- Added FAKE INDEX.DAT to TN VSH Menu.
- Dump whatever FW with psardumper.
- Copy /F0/vsh/etc/version.txt to /seplugins/version.txt.
- Enable the option and restart VSH, now your PSP version is faked.
-> To downgrade just dump a lower FW.

Download: 6.20 TN-B / Homebrew Enabler (HEN)
Source: Here