strange one to me this, as I write I'm thinking this could possibly be a faulty NAND, it's a second hand unit a friend gave me.
Initially unit wouldn't boot passed tomtom logo (reboot loop)
after a little playing with the boot loader (I've tried official latest for the unit amongst others) and updating via TTHome I can get the initial settings dialog up but after setting the time the unit freezes then reboots, as if its trying to write the settings but failing (Faulty NAND?)
I have no proof of purchase (receipt) so I'm guessing contacting TT would be as much use as flogging a dead horse!
When I use Operate my Go in TTHome it works as expected but I know this is about as useful as the a fore mentioned horse at problem diagnosis
Did the TTOIQ's ever come with the dreaded 1.100 boot loader?
You can know the bootloader which is now your One IQ Router?
If all borras (in this case better to format the memory of that One) and you connect again to the Home, install you the Navcore suitable for your gps. Then just have to patch this Navcore to maps Forum