The Weekly update V14.0.23.1.3.DEV has been officially released for Xiaomi 12 (codename is cupid). 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 12 ROM Topics Xiaomi Devices Index
Download Xiaomi 12 (cupid) China MIUI 14 V14.0.23.1.3.DEV Recovery ROM with Android 13.0. Firmware size is 5.8 GB.