OK. This is what you can try.
First of all make a wired connection between your receiver and your router. DO NOT USE Wi-Fi.
Now here is the Sound United site you need.
It contains the instructions for resetting your receiver back to factory defaults.
Carry out these instructions. If the receiver stays in that loop then that will be bad news. The only remedy after that is reflashing the receiver's BIOS. That is not something you can do. You will have to send the receiver to an authorized service center, if you can ascertain they still have the ability to do this on a seven year old receiver.
If the reset works, then you can download the correct firmware update from the site I linked you to.
Let us know how you get on. I do note that success has been variable, with some units responding to the reset and some not. You might want to attempt up to five resets if the initial ones fail.