The Stable update OS2.0.3.0.VHZMIXM has been officially released for Redmi Note 12S (codename is sea). 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: Redmi Note 12S ROM Topics Xiaomi Devices Index
Download Redmi note 12s (sea) Global HyperOS OS2.0.3.0.VHZMIXM Recovery ROM with Android 15.0. Firmware size is 4.9 GB.