The Stable update V13.0.12.0.SLECNXM has been officially released for Xiaomi 12S Pro (codename is unicorn). 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 MIUI or HyperOS 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 12S Pro ROM Topics Xiaomi Devices Index
Download Xiaomi 12s pro (unicorn) China MIUI 13 V13.0.12.0.SLECNXM Recovery ROM with Android 12.0. Firmware size is 5.6 GB.
Download Xiaomi 12s pro (unicorn) China MIUI 13 V13.0.12.0.SLECNXM Fastboot ROM with Android 12.0. Firmware size is 8.1 GB.