Sony DRU 720A Firmware Problem

Hi,
I have recently upgraded my Sony Dru720A dvd writers firmware from JY06 to JY07. A move that I am now regretting. :confused:
Since the upgrade, the drive is slow to pick up media, and is alot more unreliable when writing CDs.

Is it possible to revert the firmware version back to JY06 or am I stuck with an slow and unreliable writer?

Thanks Drifernz