Hi,
i had such a bad experience with BTC that i returned the BTC and got an LG instead.
If i remember correct it was some ver prior to 1.55 but i think 1.55 should also work.
You can get all vers of MTKFLASH here
http://wald.heim.at/sherwood/530742/dvd/mt/
MTKFLASH * R /M /B XXX.BIN
MTKFLASH flashed blindly so you should be able to flash back if anything goes wrong infact i had tried firmware for 3-4 diff makes of drives on my BTC right from ASus to lite-on none ever worked but was able to flash the drive back to a BTC everytime.