Go back to Settings > System > Developer Options and turn on USB Debugging and OEM Unlocking .
Connect your phone to your PC via USB cable.
Keep holding both buttons until the screen turns on. You will see the ITEL logo, then a dark screen with small text.
On your PC, open a command prompt (CMD) in the folder where you have ADB and Fastboot installed. How to Open Bootloader Mode on ITEL A48
The Bootloader is a low-level piece of code that runs before the operating system (Android) on your ITEL A48. Accessing Bootloader Mode is essential for advanced operations like installing custom ROMs, gaining root access, or unbricking your device.
Press and hold the Volume Up (+) button and the Power button simultaneously.
Power off your ITEL A48 completely. Wait 10 seconds. Go back to Settings > System > Developer
Use the Volume Down button to navigate to the option labeled "Bootloader" or "Fastboot" (if available).
Type the following command and press Enter:
Press the Power button once to select it. Your device will now enter Bootloader/Fastboot Mode. Method 2: Using ADB & Fastboot Commands (For Advanced Users) This method requires USB Debugging to be enabled on your phone. You will see the ITEL logo, then a
Release both buttons. You are now in Factory Mode or SPD Upgrade Mode – this is the bootloader-equivalent interface for Spreadtrum (Unisoc) chipsets used in the A48.
On your ITEL A48, go to Settings > System > About Phone . Tap Build Number 7 times to enable Developer Options.