The file is "109100010760.rgn" (direct copy and paste). It matches the other file "082700010760.rgn" in terms of naming structure. Those were the files that Garmin sent, by the way, not anything downloaded from the web. In any case, it didn't let me flash it. It said that the firmware was incorrect for this model (I forget the actual wording). When I flash using the GarminCure3 app, it renames the file to "082701000760.rgn" which is what you were expecting. And for my reference, what do the middle six characters represent?

I've tried flashing with a cure fw many times now, but it always comes up to the LOADER and the Updater utility never says "Update was successful".

The error message I get on the screen is "MISSING SYSTEM SOFTWARE" (MSS) (Sorry, I just reread my original post, and I left that part out. That would have been helpful for you all to know.) The MSS came sometime during one of the many attempts to use the Cure3 software to boot to MSM. I'm wondering if the missing system software came about because I had downloaded a bad firmware file and flashed the device. Since my initial post yesterday, I have only been working with the files Garmin sent or ones that I've downloaded from Garmin directly.

I've tried the SD card, and nothing looks like it is happening. I get the MSS error message almost instantly.