The trouble is I don't see a 'G'. The boot logo is gone from flashing 34xx. I try to press both the 40mmx25mm location (the one that worked originally) and the upper left hand corner. I have tried this before pressing power, and 1 and 2 seconds after pressing power. I then immediately insert USB in all these cases. Nothing works, the device just goes into MTP mode.
Edit: It worked! This time I waited until after pressing power, and then immediately press at the 40mmx25mm location (it seems smaller this time), connected USB, hit flash and voila successful!
Now it is saying software loading... should I reboot by long pressing power?