I was able to remove FRP with HCU, by reading FRP code and using this instead. For some reason it read fine, but the problem with dc-phonenix is still interesting.
Code:
2019-09-11 15:09:29.025 Autodetect COM port and phone type start!
2019-09-11 15:09:29.782 Found COM port: COM119
2019-09-11 15:09:29.798 Found phone type: Huawei Android phone (HiSilicon CPU)
2019-09-11 15:09:30.071 Open COM port COM119 (Android Adapter PCUI (COM119))...
2019-09-11 15:09:35.118 Connecting to server...
2019-09-11 15:09:35.372 Connected!
2019-09-11 15:09:48.488 CP State: ready
2019-09-11 15:09:48.504 Read phone basic info...
2019-09-11 15:09:50.582 Read phone secure info...
2019-09-11 15:09:56.717 Phone info data backup saved to file D:\GSM\HCU\HCU_287\Backup\20190911_150956_869676036******.BAK
2019-09-11 15:10:06.473 Read FRP code success!
FRP code: UWX9K6EG3X313G41