Downgrade and upgrading.

[justjey]

Sorry guys for being a noobie, almost a decade I never flashing elms or playing with android. Just started back with the Huawei Mate 30.

So I heard that there's a way to flash the global set version to China stock rom.
I'm kinda confused actually that how to flash a new set of rom if the bootloader are unable to unlock?

If let say can flash, does any of you guys know which Chinese stock rom to choose?
Please help...
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update: 08-07-2021

Manage to downgrade from EMUI 11 to EMUI 10.1.0.
Using Googlefier to install GMS, succeeded.
Waiting for someone to share how to flash CN firmware