It worked for on Pr20 CTL-AL00I
firmware build 9.0.0.187
Used Kirin970_T2_A8.1_V5 and write oem info
Flashed device using OTG firmware
https://androidhost.ru/T8h
*#*#2846579#*#* and go to Software Update and then select SD upgrade.
Never try to downgrade good luck