The Stable update V126.96.36.199.RFQMIXM has been officially released for Mi A3 (codename is laurel). 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: Mi A3 ROM Topics Xiaomi Devices Index
Download Mi a3 (laurel) Global MIUI 12 V188.8.131.52.RFQMIXM Fastboot ROM with Android 11.0. Firmware size is 2.6 GB.