This is kinda in the wrong section.
But it'll arrive as H9L is a rather new device but it'll take time.
Perhaps we'll have to wait too long.
As far as I know, at this moment lastest is EMUI 8.1. May be we will get it, but most likely the custom...
You are being somewhat coy about telling us what version TWRP, why I really don't know?
Pretorian80 has written numerous TWRP's, perhaps you would be good enough to link to it please?
Sorry for my long mute.
You need to roll back to the security patch, released before May 2018. Better than the January or February patch.
Also you can download from PlayMarket app named "Huawei Themes". Search words are 'deishelon'. This is not advertisement. In this app you can choose any font. Also you must turn on Text Style in Settings your phone.