It's not like they knocked off a lot of money off the list price by having these app developers pay to have them pre installed. This phone costs way more than comparable hardware.
...Every time I am notified of an Amazon update I turn on Unknown Sources, update the apps, make sure they work, than turn Unknown Sources back off...
I did all of that, and Amazon still doesn't update.I just updated my Amazon apps. (Please read the directions provided in another post here about Amazon Underground.) I enable the Audible app & then updated it. I also enabled in security settings allow install a pps from other sources. (DON'T REALLY KNOW IF THIS WAS A NECESSARY STEP OR NOT?) Then I was able to upd a team all the Amazon apps I hadn't been able to update. ☺
I had a problem updating my Amazon app. The fix for me was I had to update the Audible app first. I had the Audible app disabled, so I had to enable it and then update it. Then I was able to update the Amazon app. After the update I went back and disabled the Audible app.
Give it a try it should work.