The latest software update brings September 2018 security patch, and several other bug fixes and improvements have been made. It’s only this week that Google started rolling out the same update to the Pixels and it was picked up by Essential Phone, too.
Still, the fact that Huawei and Google are rolling out the same update on the same week is a big deal and while the update is confirmed for model EML-L09 of the P20 and MHA-L09 of the Mate 9, other variants of these two phones should also receive the same update.
The P20 users are getting software version 220.127.116.11(C106CUSTC106D001), and the Mate 9 users are receiving version 18.104.22.1688(C605).
These are OTA updates, which means it’ll take several days before the download notification shows up on your phone, so be patient.