Run the RileyROM flash tool you used to flash the KK ROM. Reboot the tablet to flash mode and erase IDB.
The safest approach would be to download one of my early JB ROM's for the M7 Pro and use the included flash tool to flash that entire JB ROM with the boot loader checked (it's unchecked by default).
After you have successfully booted the JB RileyROM ...you can then use the RKBatchTool to flash the stock ROM if you want.
Here's a thread dedicated to switching back to JB from KK.http://freaktab.com/forum/tablet-sup...an-from-kitkat
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