Purchased Xiaomi Mi Max 3 with Xiaomi.eu ROM pre-installed (https://tradingshenzhen.com/en/mi-max-3/1302-mi-max3-6gb-ram-128gb-rom-snapdragon-636.html) Tried to get settings/data/apps transferred from old phone to new, but none of the Google set up prompts appeared on boot. The following process will get it to work (hint: OpenGApps)