The Chronic Dev-Team has released Greenpois0n RC6 with support for jailbreaking theTV.
In addition to thesupport, RC6 fixes emulator issues.
You can apply RC6 over RC5 without restoring. Download it here or you can download from I-TECHS, The links is below and make sure you download the right version for you computer.
Mirror: Greenpois0n RC6
Mirror 2 :gp_mac_rc6_final.zip
RC6 for Windows:
Also you can follow one of these tutorials for assistance: