How to Open Recovery Mode in OPPO Muse R821

Recovery is a recovery mode for Android-based smartphones. There are two recovery modes: factory mode (built-in) and software mode (via third-party software). This mode is useful when it is not possible to boot the phone using the normal boot process. For example, if the phone is infected with viruses, the update has errors in the operating system, or the firmware needs to be installed. Activating recovery mode in the OPPO Muse R821 is quite simple, but you need to know the right combination of keys.

Other types of recovery

Recovery by the manufacturer cannot break anything. At most, the user will lose their data if they accidentally reset to factory defaults. However, problems can occur with modified versions.

There are two versions: Clockworkmod Recovery (CWM) and Team Win Recovery Project (TWRP). The functionality of both modes includes dangerous features - gaining root privileges, installing custom firmware and kernels.

There are useful and safe features in the modes, such as backing up and restoring from a previous backup. However, it is possible to perform these actions without a restore mod, so installing modified versions is simply not justified.

Of course, we don't want to discourage you from finding out for yourself, especially if you need root privileges or need to install custom firmware. However, we strongly advise you not to do this, as it will void your phone's warranty at the very least, and make it inoperable at the worst.

Normal start in recovery mode OPPO Muse R821

First switch off the machine, as recovery mode can only be activated when the machine is switched on. You do not need to enter any codes, just press the correct combination of keys to activate the mode:

Press the power button and the volume down button.
Press the power key and the volume up key.
Press the Power key and the Volume up and down keys.

Recovery mode is operated using the Volume Down and Volume Up buttons. The power key has the function "OK" or "Select". All text is always in English, which is the main language of the Android interface.

Accessing recovery mode with ADB

ADB - Android Debug Bridge. This is a standard command line extension that can be used to control a device connected to a computer. More specifically, it sends commands that are executed on the smartphone rather than the computer. Installing ADB is not easy, but you can either follow the instructions on the official Android Studio website or find a step-by-step guide online. The link to the official download page is https://developer.android.com/studio/index.html. On the website, go to the very bottom and look for "Command line tools only".

You will also need to install additional drivers. We recommend that you use the generic package that you can download from this link - https://adbdriver.com/downloads/. However, the manufacturers themselves also provide such drivers, but you will need to find them first. The phone must also be in debug mode for ADB to work.

After installing any third-party software, simply open the console in administrator mode from the ADB utility folder and type "adb reboot recovery". The phone will automatically restart in reboot mode.

What's wrong with using software from third parties?

There is special software that allows you to start the recuperator with a single click. But this only takes up space, as the same action can be performed with two keystrokes. And using a terminal emulator, as many websites recommend, is pointless.

Instead of Recoup mode, an Android icon appears with an exclamation mark in a triangle and "No Commands".

The error can be corrected by pressing the power and volume buttons. Press once for a few seconds. The Recoup menu will open.

By the way, another common problem is that after rebooting, a message appears saying that there is no operating system and that fast boot mode has been started. This means that you have activated the fast boot function in this mode. To deactivate the mode, press and hold the power button for 10-15 seconds.

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