First, I ran KFHD_SRT_v1.3.5 and flashed the system to 7.3.0 (rooted)
Next, I ran Restore-Factory Recovery
Next, I ran Erase cache and user data
Next, I rebooted
at that point it was working on 7.3.0
Then, I copied the 7.4.6 update to the root of the SD card and hit the "Update Your Kindle" button
The Kindle is now indicating version 7.4.6 and running normally
Now after fully charging the battery, I tap on "Sync" (which starts the curved arrows spinning) and let the thing go to sleep. This usually results fairly quickly in an update to 7.4.8 but on this Kindle every time I check (several days now) it is still sitting on 7.4.6. I have also tried Factory Reset a few times but it did not help.
I would have thought that after running the factory 7.4.6 update there should not be anything different that would prevent the OTA update from working. Am I missing something? Has anyone else had this problem? I have spent quite a bit of time searching the forum and have not found a similar problem.