Originally Posted by knc1
Does this also prevent the updater in the initramfs from running when the update file is present during a full reboot (cold start)?
If unknown, please test for that and report back.
Well, when I left an update from Amazon in the user store (Update_1615370055_1813030025.bin) and rebooted, it didn't do anything.
On the other hand, doing the same thing with a hack (update_loc_cz_4.1r62_k4_install.bin) gave me "Update error 3" on boot.
I suppose that the initramfs beast is looking for update files with a lowercase prefix of update_ or is silently ignoring Amazon signed packages that are not full updates.
I don't know how would a full update package behave on reboot though (there are no such updates for my Kindle models). It may get installed.
The problem is that deleting/damaging the update file would trigger redownloading and I'm trying to avoid that.
Maybe an init script purging any update files in user store scheduled to launch when Kindle is shutting down would solve the problem.