The "renameotabin" method involves renaming certain local programs that the current Kindle software relies on. This prevents the device from downloading the update from the server, and also causing the update process to fail (if you do manual update).
You may either do it manually, or use the packaged KUAL extension as j.p.s. told.
For more information check this:
https://www.mobileread.com/forums/sh...d.php?t=327879
I think it works on my Oasis 3 with 5.15.1 software.