Sony DRU500AX after upgrade to 2.0E PROBLEM

i have the problem with Traxdata 4X DVD-R.Befor Update (2.0C to 2.0e) i can write on this media (last Nero) with 4x Speed. After update i can write with this DVD-R only with 2X.

Please help:

Link with 2.0C Firmware or send me this Firmware to

How can I downgrade the Firmware (from 2.0e to 2.0c)