I will send a new card. It will have the necessary files to run as new.
If you can access the old card using another computer, you can copy the config.txt file to recover the config. If not, once restarted, you can find another copy of the config in the SPIFFS file system on the ESP. Instructions are here:
Also, if you can access the old card, you can try to recover the datalogs by copying them from the old card:
/iotawatt/iotalog.log
/iotawatt/histlog.log
If you subsequently have any trouble accessing the history, the files are damaged and you will need to remove the SDcard and delete those files.