Back to stock

I would like to revert to stock Amazon firmware my Kindle Touch (I want to sell it in a clean state) but this is a general question,

I currently I'm on 5.3.1 with jbpatch installed and the tricks to avoid Amazon automatic updates when connected to wifi.
Do I just need to flash 5.3.7 version or there is something else to do?
I tried to search the forum but I found nothing, maybe I used wrong keyword or this is just an uncommon question

Thank you.