The Stable update V126.96.36.199.QJFMIXM has been officially released for POCO M3 (codename is citrus). 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: POCO M3 ROM Topics Xiaomi Devices Index
Download Poco m3 (citrus) Global MIUI 12 V188.8.131.52.QJFMIXM Recovery ROM with Android 10.0. Firmware size is 2.8 GB.
Download Poco m3 (citrus) Global MIUI 12 V184.108.40.206.QJFMIXM Fastboot ROM with Android 10.0. Firmware size is 5.4 GB.