Coming from 10.0.3.0. Followed steps 12-14 and also got stuck at fastboot. I rebooted a few times and remained at fastboot. Set slot to b as per previous instruction using command 'fastboot --set-active --slot b' on fastboot 1.4.3, 'fastboot reboo...
Did this before and I upgraded to pie via the OTA update (not VPN) Gcam still works :)
Can confirm Gcam persistent after Oreo to Pie Official OTA update in the USA.