The Stable update OS1.0.9.0.UMACNXM has been officially released for Xiaomi 13 Ultra (codename is ishtar). 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 13 Ultra ROM Topics Xiaomi Devices Index
Download Xiaomi 13 ultra (ishtar) China HyperOS OS1.0.9.0.UMACNXM Recovery ROM with Android 14.0. Firmware size is 6.9 GB.
Download Xiaomi 13 ultra (ishtar) China HyperOS OS1.0.9.0.UMACNXM Fastboot ROM with Android 14.0. Firmware size is 9.2 GB.