2) Our update_*.bin packages are both signed and model locked.
At the time you joined this forum (2016) the only "hotfix" packages we had, had to be installed with OUR package installer.
It had become that way before you joined.
It was only 13 months after the jail break was released that coplate found a way to package the "hotfix" code so that it could be installed with either Amazon's "update (i.e: "install") menu entry or it could be installed by re-booting the device.
You have to be careful not to think that the way things are today, are the way things have been the entire past 20 months.
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