Where did you get those echo commands? They seem wrong.
The only way you could’ve lost your files is if you did rm command instead of mv, or moved them somewhere else.
Anyway, to restore your files, now you need to apply current firmware for your Kindle, then do two restarts in a row and apply current hotfix as an update again.
Then block the OTA updates using renameotabin as suggested in WinterBeeak instructions
only:
https://kindlemodding.org/jailbreaki...ak/disable-ota
Do not do anything manual if you don’t know what you are doing.
Otherwise you risk to brick your Kindle for good!!