How to Boot Samsung Galaxy M21s into Recovery Mode, Fastboot Mode and Download Mode

Are you wondering How to Boot Samsung Galaxy M21s into Recovery Mode, Bootloader Mode or Fastboot Mode, and Download Mode or Odin Mode? Then, follow the instructions listed on this page to successfully boot Samsung Galaxy M21s into Recovery Mode, Bootloader Mode or Fastboot Mode, and Download Mode or Odin Mode.

Samsung Galaxy M21s Recovery Mode allows a user to troubleshoot and fix problems with their device. In addition, recovery mode can access some core functions of the device, such as factory resetting the device, wiping cache, Installing updates, backup and restoring data, flash root packages and other zip mods, etc.

Samsung Galaxy M21s Fastboot Mode or Bootloader Mode is used to re-flash system partitions on the device. It is an alternative to the recovery mode but is more advanced. It helps to modify or write data directly to your device's flash memory.

Samsung Galaxy M21s Bootloader Mode or Fastboot Mode can be used to unlock the bootloader, flash a custom recovery (CWM, TWRP, Philz, etc.), flash stock ROM, flash custom image files, and more.

Samsung Galaxy M21s Download Mode or Odin Mode allows users to flash ROM, Kernel, root packages (SuperSU), and perform system updates. It also helps restore the device to stock firmware from a custom firmware.

Also: Samsung Galaxy A12 Recovery Mode and Download Mode

Boot Samsung Galaxy M21s into Recovery Mode

Below are the methods using which you can boot Samsung Galaxy M21s into Recovery Mode.

Boot Samsung Galaxy M21s Recovery Mode using Hardware Buttons

Power off your phone.
Once the device is off, press and hold the Volume Up + Power button together for a few seconds.

Release the keys as soon as you see the Samsung logo and wait for few seconds.
Now, your phone should boot into Recovery Mode.

Boot Samsung Galaxy M21s into Recovery using ADB command

First of all, install the Samsung Galaxy M21s USB Driver and ADB and Fastboot Drivers on your Windows computer.

Now, enable "USB Debugging" on your phone from Developer Options. If Developer Options is missing, go to Settings → About Phone and tap on Build Number about 7-10 times.
Connect your device to computer and open Command Prompt (CMD).
Now, enter the below command in CMD to boot Samsung Galaxy M21s into Recovery Mode.
```
adb reboot recovery
```

Boot Samsung Galaxy M21s into Fastboot Mode / Bootloader Mode

Below are the methods using which you can boot Samsung Galaxy M21s into Bootloader Mode or Fastboot Mode.

Boot Samsung Galaxy M21s Bootloader Mode/Fastboot Mode using Hardware Buttons

Power off your Phone.
Once the device is off, press and hold the Volume Up + Power button together for a few seconds.

Now, your phone should boot into Fastboot Mode.

Boot Samsung Galaxy M21s Bootloader Mode/Fastboot Mode using ADB command

Assuming ADB and Fastboot Drivers and USB Drivers installed on your computer.
Enable "USB Debugging" on your phone from Developer Options. If Developer Options is missing, go to Settings → About Phone and tap on Build Number about 7-10 times.

Connect your device to the computer using a USB cable and open Command Prompt (CMD).
Enter the below command in the Command Prompt window.
```
adb reboot bootloader
```

Boot Samsung Galaxy M21s into Download Mode / Odin Mode

Power off your Phone.

Plug one end of the USB cable to PC and while holding the Volume Up + Volume Down button connect the other end of the cable to your device.
You should see the Warning Screen with two options – Volume Up to Continue and Volume Down to Cancel and restart the phone.
Press Volume Up to boot into Download Mode/Odin Mode.