I don't think it is Asian market hardware.
I believe the B1 is the next in line after the A4.
I looked into this, that seems to be the way the D-Link revision system works. A1-A4 then starts B1.
It also looks like they quit supporting their older models with firmware once they release a B1 or a C1 rev.
I looked over their FTP site to confirm this......... ftp://ftp.dlink.com/Gateway/
Then when they go to B1, the software goes to 2.xx, C1 goes to 3.xx, etc.
So much for IPV6 for the A series router!
