Aha! Another variation!
I did another clean install of Phoscon_Gateway_Homebridge_2021-07-05.xz and I got a pin code.
However, after rebooting I just get “Homebridge is currently being installed” shown on the Advanced Settings screen.
Waiting for several minutes, and that message doesnt go away. Note: it was not set to auto-update Homebridge…
When Homebridge could be installed with the Phoscon Homebridge Image once it should also work next time. But installation will take a few minutes after the RPI boots and internet connection is mandatory and also that the RPI has correct date and time.
So does it install Homebridge now?
I would not exclude that it really is a bug related to the backup. If it still shows no pin could you check your homebridge configuration file (~/.homebridge/config.json) if there is a key.