I'm not familiar with the term "GM tool". Please define.

The main Achilles' heel with the N770 is that, either due to an N-wifi nearby or too many wifi hotspots, the N770 won't list /any/ hotspots to connect to. I can't get mine to see a wifi router 1 foot away due to this! This bug has been reported and marked as "won't fix", so that's that.

If you do get a connection, then it'll perform as you would expect, albeit slow compared to modern mobile phones or tablets.