Questions about philips DVDR1640P

I read the reviews about philips 1640 and bougth one last week. on the package they wrote 1620K , but the drive is DVDR1640P, made in malaysia august 2004 and firmware is p2.0. I flashed it to P2.2, but I have some problems about dvd-r media.
On the forums I see that benq 1620 is doing well with dvd-r media, also benq1620 and philips 1640 are the same drive. so

  1. Can I use benq 1620 firmware on my philips 1640.
  2. How can I do this.
  3. Can this upgrade damage my drive.
  4. Can I rollback my firmware if ,I dont like the new one.