You need to remove RSA from firmware (your backup) which you want to flash.
To remove RSA start Flash & Backup 3.0.7 select active phone profile: Motorola V3i, go to Firmwares tab, click to select file and select firmware which you want to flash, check down Remove RSA verification (New method for LTE2 phones), then click to Save as..., select format .SHX and write custom name (like a RSAremovedbackup).
This file flash with RSD lite. (don't use F&B to flash)