Both missed one fact
I moved house. Both AVRs packed up then setup again. Both then went through initial setup whereby it updates firmware. Yamaha technician confirmed this and no way stopping it and no way backing it out. Initialise All, or a reset doesn't touch firmware. It can't.
Whether it's flash the BIOS, reinstall, whatever the Yamaha technician here had to get approval to access something on Yamaha tech site.
It's also not as simple as updated via wifi. We are long past dial up connections. If that's an issue it should not be available.
Today, tomorrow I should get back so happy it's all fixed. After a few good movies with Dolby Atmos I might finish unpacking...