i use dvd master (ritek) 2x speed with diskjuggler 4 a04 firmware
1.31 downgraded from 1.33 you can only downgrade if the original f/w was not 1.32 or 1.33 heres a link to tool it took me 30secs to flash the drive but some have taken hours
http://firmwares.co.uk/ 1.31f/w seems the best one for most media you can get 1.31 from
http://perso.club-internet.fr/farzeno/firmware/
read here before downgrading
http://216.127.93.172/forum/viewforum.php?f=2