The firmware update is available, but it can only be downloaded to a working receiver. Will your unit stay long enough to select "Check for firmware updates," from the receiver set up menu? If not, then the unit will have to go to a service center.
Unfortunately I fear your only two options, will be to send it to an authorized service center, or take it to a recycling center, and start again with a new receiver.
It is situations like this why I'm reluctant to advise repair of receivers, as it is usually more money down the drain. As I stated before, this is not an acceptable state of affairs, but that is where we are.
The whole design of receivers and pre/pros, for that matter, is wrong. These units need to have a standard 19" rack frame and be designed in modules. Power supply module, switching module, video preamp module, HDMI module, and control module. All should slot in the rack. This would make not only repair easy, but also upgrades. Then you could upgrade without changing the whole unit. Power amps, should be in a separate amp module, with power supply and you just purchase the amps you need. So you don't have to purchase 11 amps if you will only use two.
The way home AV electronics is designed and organized is totally insane and not what is required at all.
