Okay, this probably doesn’t apply to many people because I doubt the user base for these units is very big, but I ran into this issue today.
Problem
Wanted to upgrade the firmware on an AirLink Raven X Cellular Modem (V4221-S) to the latest since what it had on it was from February 2007. Appearantly AirLink is now Sierra Wireless (or they bought them… I don’t really care…). Downloaded release RavenX_EVDOA_4.0.7.001.exe and ran it from a laptop connected to the modem via ethernet. Before reaching the 50% mark it told me “Unable to write the firmware to the modem flash”… how rude!