If you did not know, there is an unofficial version of Cyanogen Mod 9 that was released in December. Now a new version of CM9 has been compiled with some bug fixes.
Still the ROM is in an Alpha state, so not everything works. Here is what doesn’t work according to the XDA post.
No 3G / 4G
Camera doesn’t work
No HQ Videoplayback
No Netflix yet
Wallet does FC a lot
Installation instructions are the same with any custom ROM. Just check out the source link below for instructions if you need help.
The ROM works on both the Wi-Fi and 3G/4G models but data will not work on the 3G/4G models.