Old Kindle Unable to update software

[Bogumis]

Hi!

I have an old Kindle if in the options (device info) is written information:
Serial Number : B00F
Firmware Version : Kindle 5.0.0 (1347840063)
From the information that can be obtained on the website its :

B00F - Kindle Touch 3G + WiFi (Kindle 5) (U.S. and Canada) [Mostly]
K5, KT



The update option doesn't work I downloaded from Amazon version 5.1.0.bin
As you might expect, the file simply disappeared after disconnecting from the computer.
I did Jailbreak on this device from Mobileread, I don't know if it was added correctly because there was this inscription "jailbreak"

https://www.mobileread.com/forums/sh...d.php?t=225030
K5 JailBreak (5.0.x - 5.4.4.2)

I tried adding more "hacks" to force an update to a different version of the program but. anyway I don't know if I did it right

I want to make this Kindle more user-friendly Maybe just buy a new Kindle?

[Bogumis]

I successfully installed the MKK package (got "Update Successful" message), but KUAL still shows "not signed by an authorized developer" error.

Every official update (5.1.0) or custom .bin (hotfix/bridge) is automatically deleted from the root directory the moment I unplug the USB cable.

The search bar commands (;uxtp, ;log, ;otav) do nothing-no reaction at all.

I've tried a hard restart (40s hold) with the update file on the drive, but it didn't trigger an update.

Is there any way to "force" the 5.1.0 update or fix the developer keys on this very early 5.0.0 firmware without a registered Amazon account?

[j.p.s]

The developer keys expired sometime last year. How to update them was discussed in the Developers Corner sub-forum, but I don't know which threads.