How to Boot Etuline S4521 into Recovery Mode and Fastboot Mode

Want to know How to Boot Etuline S4521 into Recovery Mode and Bootloader Mode or Fastboot Mode? Check out the instructions listed on this page to successfully boot Etuline S4521 into Recovery Mode and Bootloader Mode or Fastboot Mode.

Etuline S4521 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.

Etuline S4521 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.

Etuline S4521 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.

Also: Etuline ETL-S6022 Recovery Mode

Boot Etuline S4521 into Recovery Mode

Below are the methods using which you can boot Etuline S4521 into Recovery Mode.

Boot Etuline S4521 Recovery Mode using Hardware Buttons

Power off your phone.
Once the device is off. Press and hold the Volume Down and Power button together for a few seconds.
Release all the buttons once you see the Android Boot Mode.

Use the Volume Up button to select Recovery Mode from the list of Boot Options and press Volume Down to confirm.
If the Android Bot with Red exclamation pops up, then press Power button at once.
Now, your phone should boot into Recovery Mode.

Boot Etuline S4521 into Recovery using ADB command

First of all, install the Etuline S4521 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 Etuline S4521 into Recovery Mode.
```
adb reboot recovery
```

Boot Etuline S4521 into Fastboot Mode / Bootloader Mode

Below are the methods using which you can boot Etuline S4521 into Bootloader Mode or Fastboot Mode.

Boot Etuline S4521 Bootloader Mode/Fastboot Mode using Hardware Buttons

Power off your Phone.

Press and hold Volume Down and Power button together for a few seconds.
Release all the buttons once you see the Android Boot Mode.
Use the Volume Up button to select Fastboot Mode from the list of Boot Options and press Volume Down to confirm.

Now, your phone should boot into Fastboot Mode.

Boot Etuline S4521 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
```