Alex,
1. got a Asus RX570 4 GB just today; my bootrom now is 140.0.0.0.0
2. downloaded Mojave from the App Store; got the window "upgrade firmware"
3. Let the Mojave installer shut down computer
4. Power button, holding it till long beep; straight after that the chime; I let go of power button
5. waited 30 min (I see no screen, obviously), but no restart
Should I, after shutdown, change the RX 570 back to ATI Radeon HD 5770 1024 MB just to be able to see the progress on the firmware update? Or leave the Asus RX 570 still in place (I still on Bootrom 140.0.0.0.0)?
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