Thanks!!!
I wasn't able to get into recovery mode using "ADB Reboot Recovery" directly, it would just power down my tablet
This works for me:
-hold it in landscape mode with power button at upper left
-push and hold the power button for a few seconds, let go...
-As soon as you see the Galaxy Tablet 10.1 wording on the screen, press and hold the left half of the volume rocker button. As long as you do this before you get to the "SAMSUNG" word screen you should soon see the "Android with envelope" and "Android downloading" icons.
-Hit that left volume rocker to select the "Android with envelope" icon, then hit the right volume rocker (which acts as an 'enter' key)... Now you should be in the Recovery Mode boot screen.
-Once you get into the Recovery Boot Screen, the volume rockers act as error up and down... the Power key is the 'enter' key. Apply the update from SDCard, and reboot.