I don't have the Uni anymore. As far as I remember, if you are trying to flash the radio part only (which doesn't require a hard reset afterwards), but are getting an error, try to run mtty on your PC with your qTek connected to it in bootloader mode, and wipe your Uni's ROM contents off. Take a look at the Uni's Wiki page (look at my signature).
Sorry for not being able to be more specific. I have an Ultimate 9502 since last August, and, since then, I don't have to flash my device every other week anymore...
Good Luck!
Carlos