Changing between white and black back clusters is still an issue.
So far, only DoubleDip (and maybe a few others) have worked out how to fit Black backed clusters to pre MY09 or MY08.5 models.
I havent had a chance to examine black backed cluster EEPROMs, so there is still a fair bit that is undocumented about them.
Tech2 / Holden can program like for like, but they are unable to set the Kays on used clusters. (Unlike using the EEPROM method).