, specifically involving "emergency files" or system-critical data that's preventing the phone from functioning. Windows 10 Mobile
Open a Command Prompt as Administrator in the WDRT directory and run: lumia 650 emergency files full
Would you like help finding the correct FFU file for your Lumia 650 model (RM-1154, RM-1152, etc.)? lumia 650 emergency files full
thor2 -mode uefiflash -ffufile "Lumia650_RM-1152_*.ffu" -do_full_nvi_update lumia 650 emergency files full
If the phone is lagging or the storage error won't disappear after deleting files, a soft reset clears the RAM and temporary system state without deleting your data. Press and hold the Volume Down