if you want to go back to stock 4.3 on the dell venue 8 use Dell's recovery tool that's inside the developer folder.
HOW TO INSTALL:
1. Turn off your Dell Venue 8
2. Go into fastboot mode by holding down power and volume down
3. On your computer run p801t_JB4.3_flash_device.bat
5. When the command finishes hit any key and your Dell Venue 8 should reboot in to android 4.3
You could also use this for restoring your tablet if its stuck on the dell logo (as long as you can get into fastboot mode)
P.S. you cant upgrade to kitkat after
WARNING FOR DELL VENUE 8 ONLY!!!!!!!!!
If you have a picture like this () this can fix this. I had the same problem before and this is the only thing that fixed my tablet
After doing all the steps. My tab is not working any more It gets stuck at the image you have mentioned. please help ASAP. I was planning to gift to this to my mom tomorrow.
PS: - Mine is Dell Venue 8 , 32 gb Wifi + 3g version