I am talking about GMS tutorial. On 121 or 131 it should work. You did something wrong.Yours.
I downgraded from EMUI 12 to 184.108.40.2060 with the official HiSuite release, then installed the C432E3R6P4 FW via the NV memory. Downgraded to 10.1.0.121 with the patched HiSuite and worked well, but couldn't get the Internal storage thing to work.
So I upgraded, downgraded again, this time to 10.1.0.131.. but still nothing. Crazy!