I thought I'd chime in & share my experience with this 2.0A Firmware upgrade.
My drive was absolutely flawless before the 2.0A upgrade. I've burned 50+ Memorex & Sony DVD+R media during the past two months without a coaster.
Before this upgrade, I'd done the 1.0C & 1.0D upgrades without a hitch. This 2.0A upgrade reduced my Write speed down to 1x on everything. My DVD to DVD recordings used to take about 15 minutes to Write. Now they take over an hour.
Sony's Tech Support recommended I downgrade to 1.0D. If that doesn't work, they're going to RMA the drive.
The information noted is intended solely to share my personal experience with this upgrade & to let some of you know what may occur with your upgrade.
For those of you interested in providing feedback and/or suggestions, my system specs are listed below.
AMD Athlon XP 2000+
512MB PC3200 Corsair
ATI Radeon VIVO 64MB