using ADB from the android sdk "adb devices -l" shows the device, but when you try to get a shell it says you need to use the "GMAuth tool" to get a secure connection. i assume this means you need to get a private key from gm as a registered developer.
my only other thought is to try and enter recovery mode via some button combo, and manually add a line to the file " /data/misc/adb/adb_keys " corresponding to the public key in your local cert at " C:\Users\<my profile>\.android\adbkey.pub " assuming windows.
if someone can figure out that button combo for recovery mode, ill work out the other details and post.