Smartphones running on MIUI are generally popular in the custom ROM community for various reasons. Mid-range POCO X2, which also runs on MIUI, has loads of custom ROMs. And now, its successor, POCO X3 NFC, has got a first working custom ROM within a month of its release.
The first working ROM, Nitrogen OS for POCO X3 NFC, is compiled by a senior member at XDA, xyyx. The ROM, however, is based on Android 10 and not 11. That said, this is based on AOSP(Android Open Source Project) and is sure to give a near-stock experience to users. Also, the ROM doesn’t contain any bloatware apart from the essential system apps. It doesn’t even include GApps(Google Apps) and you will have to flash it separately. XDA report also says that the ROM contains certain features hand-picked from LineageOS, OmniROM, Dirty Unicorns. If you wondering what these are, they are some of the popular custom ROMs.
That said, early builds of ROMs are sure to contain bugs. And, Nitrogen OS for POCO X3 NFC also has early bugs like broken video recording, inability to set SELinux to Enforcing mode, absence of Double-tap to wake feature. However, on looking at the current update of bugs on the Nitrogen OS XDA page for POCO X3 NFC, the bug section only lists SELinux. Hence, there is a possibility that the updated versions will fix the above bugs.
Other than this, basic features like Wi-Fi, calling, camera is reportedly working fine. You can visit the XDA forum page to download and install the Nitrogen OS ROM on your POCO X3 if interested. Do note that you need a device with bootloader unlocked, and a custom recovery like TWRP installed on the device as a pre-requisite.
POCO launched the POCO X3 smartphone recently at a price tag of around 199 euros. The device features a 6.67-inch FHD+ LCD display with 120Hz, Snapdragon 732G SoC, 64MP Sony IMX 682 equipped quad rear camera, 6,000mAh battery with 33W fast charging.