Im assuming this thread is dead, but the way to fix it is by using android SDK assuming you have usb debugging enabled.
I can remember completely fixing this problem by doing a restore on my tablet, without the volume buttons trying to use the hard reset option ON the tablet is impossible.
step 1: obtain android sdk (install to C:\ to make it easy, under C:\android for conveniance)
Step 2: plug in tablet and turn on
step 3: shell root your tablet (super one click or whatever)
step 4: change environmental variables
step 4a: (windows only) right click computer, then click properties, then advanced system settings
step 4b: advanced tab, then environmental variables, go to the system variable box
step 4c: scroll until you find path, change the path of path (sorry if confusing there) to c:\android\tools (or wherever you installed android sdk and navagate it to the /tools/ folder) save the variable and exit that
step 5: open command prompt (windows key + r, then type cmd.exe) type adb shell
step 6: type "adb devices" without quotes make sure your device is there
step 7: now if your device is there thats good, if not you're screwed and haven't got usb debugging on so type these commands in
adb shell
if there is a # there you're all good
if there is a $ you did the shell root wrong, retry that
now type wipe data
I have another full guide on this at
http://androidforums.com/dodo-pendo-pad/417664-pendo-pad-backup-flash.html
I hope that helped