Best answer by DRSC Media
For a factory reset, since your PC doesn't recognize the device, you can do a backup via Huawei Cloud, for things such as Notes, Contacts, calls, and your Gallery. Otherwise there's other backup solutions such as Google Drive/OneDrive, etc
You can alternatively transfer all your data on a different phone via Huawei Phone Clone.
Before resetting the device, make sure to delete your google account from it first.
If the reset does not solve the issue, you can contact Huawei's hotline in the UK (or your country) to obtain more information on how to send the device for a repair.