just got a Toshiba SD-M1712.

one of the last ones i guess. i called up some 10 vedors/computer shops, and most of them didn't have it, had the SD-M1802.
anyway, the tech at the shop where i bought it told me it was a Multi-Zone drive. being suspicious i inquired further, and was told that they actually flash the Toshiba drives with a Multi-Zone firmware when they get them.
what i would like to know is: how can i tell if this is THE "official" hacked firmware by hijacker from rpc1.org?
(i asked the guy where he got the firmware he flashed the drive but he couldn't tell me exactly. had some link but it was broken. it definitly wasn't http://hijacker.rpc1.org/toshiba_nolimit/ , maybe a mirror?)
is there another firmware about?
Nero InfoTool info:
the drive is identified as Toshiba DVD-ROM SD-M1712, firmware version J004.
in the DVD features:
Region Control: RPC I
Region Code: All
Changes Left user: n/a vendor: n/a.
Device Manager -> DVD Region tab:
Changes remaining: 2
Current Region: Not Selected
after reading here http://hijacker.rpc1.org/toshiba_nolimit/ i suspec that this is indeed hijacker's hacked firmware. is there a way to confirm this?
is it possible to flash the hacked J004 firmware "over" the current one (just to be on the safe side)? is it recommended/not recommended?
BTW what does Current Region: not selected in Device Manager mean?
TIA