The Stable update V188.8.131.52.SLDCNXM has been officially released for Xiaomi 12X (codename is psyche). 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: Xiaomi 12X ROM Topics Xiaomi Devices Index
Download Xiaomi 12x (psyche) China MIUI 13 V184.108.40.206.SLDCNXM Recovery ROM with Android 12.0. Firmware size is 4.2 GB.
Download Xiaomi 12x (psyche) China MIUI 13 V220.127.116.11.SLDCNXM Fastboot ROM with Android 12.0. Firmware size is 6.1 GB.