Another way is to get someone with Coloros 12 EU to download the OTA with PC and send it over here.I tried to downgrade but my city service center hasn't A10, he flashed two wrong A10 files, system was bricked, then flashed A11 to repair.
EE is a sh*t i spoke with them they said we don't know when we push update
I remember last year we got A12 1 month after all users.