What leads you to believe that â€œonly workaround i can fathom would be to flash the firmwareâ€? Firmware doesnâ€™t have any thing to do with your problem. Most certainly it is always prudent to have the most current up to date Firmware installed on your DVD-Burner to obtain optima performance form your DVD Burner but if currently you have the most current up to date Firmware installed it is unnecessary to install Firmware.
Sony doesnâ€™t manufacture the vast majority of the Media with the Sony brand name stamped on the Media package. The majority of the Media with the Sony brand name stamped on the Media package is actually manufactured by various Media manufacture sub-contractors. Unfortunately many of these Media manufacture sub-contractors produced less than desirable poor quality problematic Media. Suggest discarding your known well-documented poor quality problematic Sony branded Media.
Suggest obtaining known proven quality error free Media such as Taiyo Yuden an/or Verbatim Media which has a well documented history of producing known proven quality error free Media.