I have to admit I haven't unlocked my mr200 but 192.168.225.1 works and I can do all above from openwrt
I'd actually wanted to upload the unlock modem fw but considering the possible issues above (unusable with openwrt) I'd say I'll pass for now as I don't really need to switch WISP.
thanks for sharing this though - maybe you can add this to wiki - Applying for OpenWrt wiki account