Hello m8, welcome to the community :)
Well, things aren't as they seem to be in this case. i think..
Try flashing ur drive back to the previous version the 4Bs2 firmware. this should fix ur problem..
also try flashing it with the "Liteon Unscrambled" which u can find at codeguys. it's common and this should do the trick. and don't worrie, about the Liteon thingi, Teac and Liteon share the same build. to the nat that is :)
Hope it works m8, looking forward to listen from ya