1.2.8 with sound 1.2.2
Enjoying this custom firmware with the sound of ver. 1.2.2. Might be not 100% the same (dont remember exactly how the official 1.2.2 worked for my ears), though huge soundstage and the overall SQ make it to be a killer-firmware with all the features of the latest updates.
It is the one with the 65mm ribbon. I got it from mfactors.com in the USA - prompt delivery and really good service for a total cost of $30.