Liteon 4824 help me

hi guys
i have an liteon 48 24 48 and today the recorder not work properly.
start to burn a cd with nero,the burn process is ok but when nero start to compare the files say this error: ERROR CD NOT MOUNTED.
No data recorded on cd :frowning:
when i try to burn an iso whit alchool120% the burn process is ok but the cd is unreadable.
i try to re upgrade the firm whit liteon upgrade utils but the program give me this error: BIN AND DRAM COMPARE FAIL or similar.
i try to downgrade the firm “hacked” with flashfix but have the same error :((((
some1 give me any help???
tnx in advance