Open a command window in your Platform Tools folder.
Type the following command and press Enter: How to Open Fastboot Mode on NOKIA 2.3
Fastboot (also known as Bootloader Mode) is a diagnostic tool used to flash system images, unlock the bootloader, or install official firmware updates when the phone is bricked or stuck in a boot loop. Method 1: Using Hardware Keys (No PC Required) This is the most reliable method for the Nokia 2.3. Open a command window in your Platform Tools folder
Always back up your data before modifying system partitions via Fastboot. unlock the bootloader