Same issue, i can't login after Upgrade de Firmware from default to wpa4220v4_eu-up-ver4-0-4-P1-20220408-rel36351-APPLC.bin. Process was successful.

I just put in the powerline adapter and connected two machines. It all works. If I go to the web interface I can login using the default password, admin. If I open the tpPLC utility I see the network