Xiaomi Mi Mix 2S and Mi Mix 3 users can enjoy the delights of the Android 11 operating system thanks to the release of the ArrowOS 11.0 custom ROMs for those devices. This will be especially handy for those with a Xiaomi Mi Mix 2S smartphone, which was originally released with the Android 8 Oreo software.
https://www.notebookcheck.net/Xiaomi-Mi-Mix-2S-and-Mi-Mix-3-owners-can-sample-Android-11-via-ArrowOS-11-0-custom-ROM.498752.0.html