Unfortunately on the tablets based on the P10AN01 board (Advent Vega, pov Mobii, Viewsonic Viewpad 10s, Smartsurfer 100, UX100, …) there is no possibility to enter recovery with a button combination during power on.
So if you get stuck with none booting tablet, you have to get back to a stock ROM, loosing all your installed apps, data and settings. Of course you can restore your backup, but there is an easier way to go from a stuck tablet back to a full restored working tablet.
Install ClockWorkMod recovery. Make a nandroid backup.
Get VegaFixer and follow the instructions.
When you get stuck next time, VegaFixer will flash the nandroid backup (including your apps and settings) and you are back to full working machine.
VegaFixer helped me many times already. Because I am playing around with framework-res and other system stuff I get often stuck with a none booting tablet. VegaFixer helped me out every time to my tablet up quickly again.
credits go to
mad-murdock @ XDA for the ClockWorkMod
add.thebad @ MoDaCo for creating the ClockWorkMod installer
zebrahead @ MoDaCo for creating the VegaFixer