The checksum fail is a result of the new firmware when it boots up for the first time and reads the old stored configuration. I don't know why that happens with just this update and not past ones (especially when profiles were added), but I digress... maybe they changed the checksum algorithm in this update.
In any case, generating a new config on the website and loading it gets rid of the checksum error and ensures all your settings are correct. As a rule of thumb I always make a new config.alp and put it on the same USB as the firmware when I do an update, so everything gets updated in one go.
Connect With Us