thanks for your replay...
my drive was dead but visible by Windows, with Firmware Flashing Tool (update boot code, update) I flashed using a binary firmware of 451s (I got only a .exe firmware of my 1s45). The burner seemed good and I tried burning a cd...wow it's ok..but every time I try to play the file on the cd windows crashed. After this my burner is visible only during the boot no in windows. So, I tried either mtkwinflash and mtkflash in DOS but without success.
Mtkwinflash : "ERR. fail to identify the flash type"
sorry for my poor english