Q: What's MIUI 7 stable version?
A: MIUI has 3 ROM versions: Experimental, Developer, and Stable.
Experimental version is updated every day, and is open to a small part of senior members. It includes new features and bug fixes for the senior members to test before they enter developer version, therefore it contains high risks of serious bugs
Developer version (China) is updated every week, developer version (Global) is updated bi-weekly. It get new features and bug fixes in every update, and is stable enough for daily usage
Stable version doesn't have a regular update frequency. It's updated once a month/two months/even longer. Stability is its major concern. Common users who prefer ROM stability are recommended to use this version
Q: Which devices could upgrade to MIUI 7.1 stable version?
A: Global MIUI 7.1 stable version supported devices are: Mi 2/2S, Mi 3, Mi 4, Mi Note, Mi 4i, Redmi Note 4G, Redmi 2 / Prime, Redmi 1S, Redmi Note Prime, Redmi Note 2, Redmi Note 3G, Mi Pad
How to Update to MIUI 7 Global Stable Build? Click Here For More Details
Q: How to upgrade to MIUI 7 stable version?
A: The upgrade method depends on the MIUI version you're currently using on your device
If you're using MIUI V5/MIUI 6/MIUI 7 stable version on your device, you can update directly on your deivce via OTA, or flash the full ROMs in recovery or using Mi PC Suite.
If you're using MIUI China developer version or Global beta build, you can flash the full ROMs in recovery mode after wiping all user data.
Q: Are there any notes I need to taken before upgrading to MIUI 7 stable version?
A: It's highly recommended to back up user data before updating. OTA update is safe procedure, it's not necessary to back up data. But if you update using full ROM, it's better to back up all your data to a computer. Please don't update accross MIUI versions (experimental / developer / stable). If you really need to update accross MIUI versions, make sure to wipe all user data in Recovery mode before updating.
Q: Could developer version 'upgrade' to stable version?
A: The answer is yes. But you can't use the OTA method to update, and can only flash the full ROM. As developer version is actually advanced than stable version, there will be data conflict between the two versions, therefor make sure to wipe all user data in Recovery mode before flashing the ROM.