Hi,
Any SIFU here has experience can share ways to revert back to Android 9 from Android 10?

Global MIUI 11.0.5.0 Android 9 previously (Stable)
Global MIUI 11.0.4.0 Android 10 latest OTA(updated on 06-Feb 22:30, after update it show BETA stable, its a BETA)

1. faced issues with 11.0.4.0 and want back old ROM...... can manual download 11.0.5.0 ROM and install?

2. will data gone?

Normal Global ROM OTA(not FASTboot/sideload/EU/China) update can retain all data.

* no need to advice me to fastboot or sideload or EU. TQ!

bought once cheap 4300mah BM4E(original spec is 4000mah) from shpee(sold out) and it works for a year already
use original poco F1 charger can quick charge but as all other quick charge battery(unless its twin-cell in gaming phone), its bloats faster... so, i switch back to 1A instead of 2.3A, let it fill up slowly, less heat too also avoid in car charger

family device that i DIY before:
2012 MI-3W (battery twice, still alive)
Redmi Note 3 (battery, lcd+digitizer, lost)
Redmi Note 4X (battery, lcd+digitizer, lost)
Redmi Note 5 (battery, lcd+digitizer, still alive)
2019 Poco F1 128GB (battery)
2019 Poco F1 64GB (lcd+digitizer)

*all global stock ROM but off all permission to the MAX......