First, connect your phablet to PC and copy over your connection info:
# phablet-network -n
or just create new .conf file on the phablet at
Start adbd as root
# adb root
# adb shell
Edit file (if you don't like vi, you can always use ed :), not sure if there is any other editor available. You could also edit this file directly on your PC)
replace with MAC address of your AP.
Save file and
reboot the phablet.