The Stable update OS1.0.5.0.ULACNXM has been officially released for Xiaomi 12S Ultra (codename is thor). 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 Ultra ROM Topics Xiaomi Devices Index
Download Xiaomi 12s ultra (thor) China HyperOS OS1.0.5.0.ULACNXM Recovery ROM with Android 14.0. Firmware size is 6.0 GB.
Download Xiaomi 12s ultra (thor) China HyperOS OS1.0.5.0.ULACNXM Fastboot ROM with Android 14.0. Firmware size is 8.1 GB.