I was using an older ViperXL ROM and loved it. I decided to update to the latest Full ROM currently posted here. Followed the guide from that thread. After completing the process seemingly successfully, I cannot use the device anymore. It has been continuously rebooting for over 12 hours. I left it trying overnight to see if it would eventually gain sanity... no joy. I can force to the TWRP configuration choices and have tried a couple of times with the .zip file that I validated for MD5 hash for ViperXL.
I have been choosing to omit a bunch of the apps such as Facebook, Twitter, etc. during the process. Just mention this in case there might be some interaction with the omission process.