There two things that I like to take care of.
1. Restoring functionality.
2. Going on 4.1.
Do you mean with Jailbroken, maybe this:
https://wiki.mobileread.com/wiki/Kindle4NTHacking. I have done this in the past hours, the file named "you are jailbroke" or something like that apeared also.
What do I do then with your file? Send it to my kindle-mail maybe?