dev_hdd0/home/00000X/exdata rename act.dat to act1.dat if manually (like rap2rif or reactPSN should do it) before removing dongle just in case you dongle is like mine always safe to have a backup of act.dat on PC anyway
same as you i got dongle when 2.2 just came out. I also had working act.dat before TB. It might be a PS3 model thing, like some people having to use recovery mode to install CFW and some people dont

