5530 Xpressmusic Eno Sw 110054 Nokia Firmware Rm504 Eno 110054 V10exe Top [new] Direct

Remove the battery. Look at the white label inside the phone. For RM-504, common product codes:

This is the most critical part of your query. In the world of Nokia modding, "ENO" (or sometimes referenced in contexts like Phoenix Service Software or JAF ) usually refers to Dead USB Flashing files . Remove the battery

Users often downgraded their phones back to because: Remove the battery