You confuse two things: there is a difference between a flash image that run in the flash memory on your receiver and a USB-image, that run on a USB stick connected to the receiver. A flash file has the extension .ird in this case, a USB image consists of a .tar.gz you have to unpack and install on the stick to be used.

The short answer is therefore: no, unfortunately you cannot. The long answer is this: try and get AAF recovery to work. Then you can in install the TDT Maxiboot loader and run a USB image.

Regards,

Audioniek.