The Stable update V10.3.5.0.PFJMIXM has been officially released for Redmi K20 / Mi 9T (codename is davinci). Before updating, please make sure you have downloaded the exact ROM matching your Xiaomi phone/tablet. In Fastboot mode, you can check model code by typing
fastboot getvar product in cmd/shell.
The firmware files posted here are all official Xiaomi ROM, xiaomiROM.com do not own and never modified those firmwares，you will always download the file from Xiaomi server.
You may interest in those contents: Redmi K20 / Mi 9T ROM Topics Xiaomi Devices Index
Download Mi 9t (davinci) Global MIUI 10 V10.3.5.0.PFJMIXM Recovery ROM with Android 9.0. Firmware size is 2.5 GB.
Download Mi 9t (davinci) Global MIUI 10 V10.3.5.0.PFJMIXM Fastboot ROM with Android 9.0. Firmware size is 3.5 GB.