Welcome to CDRLabs, Zwanrock78!
It is normal for the A1 drive to be recognized as E1.
As far as the firmware goes, some things which should be considered before flashing a non-Sony firmware are that it might invalidate your warranty and it might make your bundled software not work, as Cowboy Slim said. I have a Creative Labs drive that I flashed to a Lite-On firmware, and the software that comes with it no longer recognizes it. That said, the Lite-On firmware won't have that "Turbo-Boost" thing and may have better writing quality.