What is anti-rollback for Xiaomi Smartphones and how to solve it [GUIDE]

Xiaomi is modding. Holding a smartphone Xiaomi for many it means having a terminal that you can modify, improve and customize to your liking.
Lately, unfortunately, the Chinese company preferred by millions of users in the world and thousands in Italy, is increasingly implementing systems to "discourage" this type of use, starting with the increase in the hours of waiting for the unlocking of the bootloader (even 1440 hours for some terminals), and finally the introduction ofanti-rollback.

What is anti-rollback?

is Xiaomi anti-rollback

The anti rollback, for the uninitiated, is that perverse mechanism that does not allow us to downgrade, ie it prevents us from passing from the installed firmware to a previous version. Officially the Chinese producer explains to us that this system serves to guarantee greater stability and security, but in practice many owners of an Xiaomi device found themselves a paperweight terminal.

Fortunately for us not all types of downgrades are dangerous, but only those of a different "category": for example, for example on all Xiaomi Redmi Note 5 (codename Whyred), the global roms prior to the version 8.7.6 beta and Stable 9.5.19 they are of one category (v3), the following of another (v4); if we are v4 we cannot move to the previous category.

There is a very simple way to understand if our mobile is in one category or another: put the phone in fastboot and type the following command on cmd

fastboot getvar anti

If our MIUI ROM is v4 version then it will not be possible to switch to a v3 ROM, worth the mobile phone as an ornament.

How to restore an Xiaomi smartphone in case of brick after rollback

In recent days, luckily, some users have found a system to recover the Whyred (Redmi Note 5 - the most popular terminal among those affected by ARB), so the following steps apply exclusively to Note 5; let's see how:

  1. Download this file
  2. Extract the file
  3. Download I Flash Tool
  4. Open Mi Flash and select the first downloaded file
  5. Start the Flash
  6. Wait patiently until the flash ends

Which Xiaomi terminals are affected by anti-rollback?

I remember that currently only Xiaomi terminals with Android 8 Oreo they have this perverse mechanism including Xiaomi Mi max 3, Xiaomi Mi 6X, Xiaomi Redmi 6 pro and most likely other phones will soon have this plague, so be careful!

The most popular MIUI custom roms (Eu, Masik, Revolution, MS, etc) eliminate fw so that from any ROM you come you should have no problems. You should also have no problems with the various AOSPs like AEX, Pixel, RR, etc.

Thanks to Nicola for the guide

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