Immediately after the screen turns black, execute:
Execute the standard Fastboot reboot command: How to Open Fastboot Mode on NOKIA C1 2nd Edition
fastboot devices Expected output: TA1311XXXXXX fastboot Immediately after the screen turns black, execute: Execute
adb reboot bootloader The device screen will go black for 3-5 seconds. Do not interrupt. Immediately after the screen turns black
Connect the device to the host via USB. Verify connection: