Downgrade Pionner A05 Firmware 1.21 Ya Es Posible

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I found out a way to downgrade A05/105 drives now, check this out:

D:\a05\test>upgdvd

/// DVD-ROM/DVD-RW Firmware Update Utility Ver1.25C

Start updating the device No.1.
Current Revision>> PIONEER DVD-RW DVR-105 1.21 02/12/06
FW is already latest.
0drive(s) have been updated successfully.


And now...

D:\a05\test>upgdvd /F

/// DVD-ROM/DVD-RW Firmware Update Utility Ver1.25C

Start updating the device No.1.
Current Revision>> PIONEER DVD-RW DVR-105 1.21 02/12/06
FW is already latest.
Continue because Force Update option is specified.
Now updating the firmware.
Please do not turn off the power and do not reset the pc.
Processing 100% --> Data transfer complete
Now internal re-flashing...
New Revision >> PIONEER DVD-RW DVR-105 0.58 02/09/19
New FW = GENERAL
Success to update the firmware.
Update operation is completed.

As simple as by using Command Prompt under WinXP.

It take me around 10 minutes to found out and doing tests. It works perfectly.

Here's the file:
http://gradius.rpc1.org/dvr/a05_downgrade.zip

Enjoy.