Messaged ZTE about the EU update to the A2020G variant.
"Thanks for contacting ZTE, we are sorry for the inconvenience caused to you.
We would like to inform you, updates when available are sent onto the phones via OTA (over the air).
Also it will be released based on the IMEI numbers as well, hence we kinldy request you to wait for the notification on your device for the update."
Guess its luck of the IMEI draw .