Can the operating system of the smartphone roll back to the older MIUI version through OTA push?

All of the smartphones don’t support rolling back the system version. Rolling back the system version, or downgrading the operating system (OS) on a smartphone, can have several disadvantages.
For your reference, here are the key points to consider:
1. Older OS versions may have security vulnerabilities that have been patched in later updates. Downgrading could expose your device to these risks;
2. Older OS versions might have unresolved bugs and glitches that were fixed in subsequent updates;
3. Manufacturers and app developers focus their support on the latest OS versions. Rolling back means reduced or no support for troubleshooting and technical issues;
4. The process of downgrading the OS can sometimes go wrong, especially if not done correctly. This can result in the device being "bricked," or rendered unusable.