If you're talking about a High Sierra HS 1400, the run current is about 300 mils, and the stall about 1,200. I doubt seriously that you need the firmware changed.
I have to assume you don't have any matching network on the antenna as well. If that's correct, go to my web site and look under Antenna Matching.
If you still can't get it to work, send me an e-mail with a more complete description. As in, where and how it is mounted, etc.