Well, that’s not really a question - but it is frequently suggested that reloading firmware might fix problems.
eg, https://forum.sierrawireless.com/t/how-to-restore-levels-filter-in-ds-1-1-2/4966/5
The point is that reloading firmware restores settings to their defaults - so this will obviously fix any problems that were due to mis-configuration!
See: https://forum.sierrawireless.com/t/network-registeration/4762/13