1. don’t worry
2. download latest firmware with drivers and dedicated ”upgradeDownload” tool
3. file (from 2020-09-12, official webiste): https://onedrive.live.com/?authkey=%21AAvx90o1p1kgzoQ&cid=A120532B51026BDA&id=A120532B51026BDA%213107&parId=A120532B51026BDA%213082&action=locate
3.1 Filename: P20HD(N6H1)_Android 10.0_EEA_V1.02_20200731_SZ.zip, size: 1,49 GB (bytes: 1 604 823 966)
4. Install drivers from ”Upgrade Driver” direcotry
5. Open UpgradeDownload tool or get SPD Factory Download Tool R24.0.0003 (mirror https://muszak.eu/wp-content/uploads/dlm_uploads/2020/11/SPD-Factory-Tool-R24.0.0003.7z )
7. Click gear, find Firmware.pac
8. Connect usb and Press Play button inside UpgradeDownload tool or read ”Upgrade tutorial.pdf”
9. Wait… uff…