Update #2: So, a friend had a MicroHD recovery cable which he let me borrow. Armed with the ALI Editor and .udf file from the sticky, I tried to install the .udf file. It took me a while to realize I needed a driver for the device, but after I found a USB-to-serial driver and got it installed, I could see the device in the Device Manager conveniently annotated with the COM port number I needed for the installation. I launched the ALI Editor and, following the instructions in the sticky, finished updating the corrupt .udf file in less time than it took to write this sentence...continuous boot problem solved!
So when I got home from work, I updated the firmware in the MicroHD by USB, remembering again to do a factory reset and pull the power cord for at least 10 seconds. Then I went outside, removed the dish from its post, tightened the motor shaft to fix the problem that started all this, rezeroed and reset the SG6100 motor using the instructions in the manual, and reinstalled the dish on the post. I reinserted the USALs data, drove the dish to G19, and called my long-suffering spouse to assist in yelling the signal strengths to me on the balcony. I moved the dish a degree or so and peaked the signal in less than 5 minutes. I ran down a few satellites to prove that everything is working properly. Good again!

The entire process described in this paragraph took less than 30 minutes.
I think the secret to getting good signals quickly was that I carefully set my latitude on the motor scale, properly set the dish elevation using the chart in the motor manual (which is actually the motor shaft angle of 35 degrees minus my declination at 47.5 degrees north of 7 degrees, resulting in a dish angle of 28 degrees) and insured that the mounting post was truly plumb. I set my true south by noting the path displayed on the satellite dish setup web site over some small bushes in my yard, which resulted in an almost perfect true south setting on the first try.
The great instructions in the stickies and the friendly suggestions from members of this forum made this setup easy. I guess my time in the military taught me to follow instructions carefully. Thanks to all those who provided the helpful information to this newby and led this project to a successful conclusion. My hat is off to you guys and gals!