Quote:
Originally Posted by j.p.s
But going in the other direction (lower version number), could this be a way to block KFX delivery? (possibly subject to constraint of lowest version ever available for a particular model)
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As a test on my PW3 I changed version.txt to indicate the build of the initial release firmware version (5.6.1.1 build 2634130033) that predates KFX format. After rebooting I downloaded a book that had previously been on the Kindle in KFX format and it downloaded in KF8 format instead.
Unfortunately the user interface of the Kindle became seriously messed up and unusable, with a mix of old and new UI elements. The top drop down menu could not be activated. Library view disappeared. After opening a book it was impossible to close it through the UI.
I finally restored the version number and did a factory reset to make it usable again.
Update: It appears that during my testing the Kindle "updated" itself to version 5.13.7 which was an older version than was actually running on the device. That may have been the actual cause of the UI failure. I recommend that anyone setting a fake build version should block OTA updates first.