The Stable update OS3.0.301.0.WBNIDXM has been officially released for Redmi 15C / POCO C85 (codename is dew). 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 15C / POCO C85 ROM Topics Xiaomi Devices Index
Download Redmi 15c / poco c85 (dew) Indonesia (ID) HyperOS OS3.0.301.0.WBNIDXM Recovery ROM with Android 16.0. Firmware size is 5.3 GB.