451@832 no disc is recognized

I’ve crossflashed my lite-on 451 to 832. Everything fine then I’e reset the learnt media calibration data with the EEPROM utlity and from then on no disc is recognized. The drive seems to be ok as long as I could restore the old firmware and EEPROM and then also crossflash again but the problem still persist. No matter cd or dvd recorded or blank i insert it just blinks green 2 or 3 times and that’s it.
Please help

which firmware did you use for crossflashing?

the latest i’ve found on codeguys web site CG5J - patched - improved burn quality (for 451S, 851S, 812S, 832S, Sony 700A, etc.)
i’ve also flashed it back to the original firmware with no result, the operation is always successful but no disc ir recognized.

Don’t really know what to do more, I Need help!