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Hmmn, I'm guessing I installed the backdoor directly since I have that file and the uninstall folder in a folder on my pc.

I do have KUAL installed. But unsure if I have the right extensions to use that to disable the back door.

The menu for Kual on my device is as follows:
Kual: sort menu , save and reset , quit
Helper+: Install MR packages, prevent screensaver, allow screensaver,device ID
BBB: Load firewall/BBB filter, Remove BBB filter, Generate packet report, clear packet counters, load factory firewall
Screensaver:Show current version etc.
Skipstone: doesnt seem to have items as when I press it , goes back to Kindle page 1 of book title listings

Edit: I installed the backdoor extension and then turned it off
Edit 2: It has successfully updated to 3.4.2, then I turned the backdoor extension back on in Kual. However, Im pretty sure I originally installed without Kual so wondering if that will create a problem?
Edit 3: I uninstalled the one without Kual. All seems to be ok.