let's do things in the old fashioned way (the one i like, not fancy gui that don't let you understand what you're doing)
connect to the tablet through adb and type these commands
the system will reboot to the new flashed recovery
connect to the tablet through adb and type these commands
Code:
adb push recovery.img /sdcard/
adb shell
su
cat /sdcard/recovery.img > /dev/block/nandg
sync; sync; sync
echo -n boot-recovery | busybox dd of=/dev/block/nandf count=1 conv=sync; sync
the system will reboot to the new flashed recovery