You can Google P20 pro emui 10 beta download, download it (BACKUP) reboot while pressing power and vol down with phone connected via USB to PC and update manual..
or
download beta app and hope you can sign up one of these days.
or
wait until 2020 for ota.
... hope it made some sense. :cyclops:
---------- Post added at 03:48 AM ---------- Previous post was at 03:45 AM ----------
and sorry for not providing links, I'm not stationery and in a rush so was the best I can offer as of this moment.
RebelRegards aosiyodk