Unable to reset or update firmware on Netgear M1

I purchased a nighthawk M! second hand and it seems to be locked (firmware) by maple wifi. I cannot update the firmware or reset it. The admin page when logged in doesn't even show correctly - i think it's a custom firmware version from maple wifi. My SIM is being rejected (Bell canada sim card). I'd image there's a way to unlock this device to start from scratch as the device should be when you buy it. Any advice?