CXMB for 6.20 TN-A is released. CXMB is a custom firmware plugin that allows users to install custom XMB themes in CTF format straight from Memory Stick. An Asian developer known as Patpat has released a version of the popular plugin CXMB (Custom XMB) compatible with 6.20 TN-A. This plugin will allow users using the HEN to install custom .ctf themes instead of the regular old PSP theme or other official themes.

Here the instructions for enabling the CXMB plugin:
- Download the CXMB for 6.20 TN-A plugin below
- Extract the contents of the download and copy the CXMB & seplugins folders to the root of your memory stick or internal memory
- Open (or if this is your first plugin, create) the vsh.txt file and add this line: ms0:/seplugins/cxmb.prx 1
- Download the compatible theme and place it in ms0:/PSP/THEME
- Reboot your PSP and reload the HEN. The plugin should be enabled automatically and the theme should be displayed

Download: CXMB for 6.20 TN-A
Source: Here