PX-712UF no longer reads CDs after firmware update

[MrPepka]

I come back to the topic. I have a similar problem. My drive (Plextor PX-760A) is not reading some discs. The problem is strange though, because it can read some CDs but cannot read some CDs. Likewise with DVD. It can read some DVDs and not others. It sometimes reads some CDs, but the dump quality is very poor. Is it also a laser failure in my case? I bought it on the Allegro in used condition. I realize that the Plextor 700 series have poor lasers and I would prefer to buy an LG or Asus drive, but the problem is that I have a lot of multisession discs in my collection that can only be dumped in DIC on the Plextor 700 series, and the drives from this series on USB are even heavier to buy, I also have Audio CDs with game music in my collection and when I dumped them on the previous drive (Optiarc), my dumps were rejected because they were not made on Plextor. Can I repair the drive at home (for example, clean the laser or something)?