i've already tried to build a cfw on mfw builder but i response an error.. if i install this bd emulator on an usb i can convert the ps3 dex to cex so i will istall a noBd Cfw?..You can either try to find or build yourself a noBD CFW for DEX or enable BDEmu from the debug settings and plug a USB that has BDEmu setup.
https://store.brewology.com/ahomebrew.php?brewid=218