Nokia C20 Flash Tool -
Boot the phone into recovery mode (Hold Power + Volume Down during startup) and perform a "Wipe Data / Factory Reset".
Click it, navigate to the folder where you extracted your Nokia C20 firmware, and select the .pac file. nokia c20 flash tool
Wait a few minutes for the tool to successfully load the firmware structure. The firmware name will appear at the top of the tool interface. Step 4: Connect Nokia C20 in Boot Mode Turn off your Nokia C20 completely. Boot the phone into recovery mode (Hold Power