Yes, redownload the firmware. The latest version of the firmware is available on the Sierra Wireless website in the downloads section for the specific module, e.g. here is the WMP100 firmware version 7.51: http://www.sierrawireless.com/en/Support/Downloads/AirPrime/WMP_Series/~/media/Support_Downloads/AirPrime/Software/R7.51.0.201205311751-cus-wmp-01.ashx
If you want an older version, you may have to contact your distributor.