If none of these work, the printer may have a hardware fault (e.g., corrupted NVRAM), which typically requires main board replacement.
Samsung Printer Reset & Error Code Guides - Farbtoner.com GmbH Firmware Reset Samsung M2020w
Performing a firmware reset will erase all saved settings, including Wi-Fi credentials, network configurations, and admin passwords. Only proceed if you have your Wi-Fi password and a USB cable handy for reconfiguration. If none of these work, the printer may