Yeah, sorry, 5.16.2.1.1 is the absolute last FW where you can get JB.
Don’t update yet, get JB first. Then download manually by changing the exact link to file: start downloading whatever current one is in PC browser, pause it, copy its link, paste link and edit the last digits to 5.16.2. Then download and install. Then RESTORE JB (post #2 still helps).
In the very end do not forget to both install AND activate renameOTAbin (or BinaryRename) to make sure you block new updates.
Of course, needless to say, do all these operations with Wi-Fi off, and also delete any existing update file on Kindle, if you happened to have Wi-Fi on before blocking binaries.
|