Hi,
In the last 2 year I encounterted endless intolerable '''Constant System Updates notifications which were ended with failure any time I agreed.'''
To be more accurate, my phone is Motorola Moto g 4th generation (XT1625, MPJ24.139-64 (android 6.01) Amazon edition).
Motorola/Lenovo suppport team did not answer my requests and non of the alternatives offered in the internet helped me.
Every once in a while I tried to find a solution and here is '''a workaround I found this week''':
If you follows the instructions of '''dosangst''' in “[https://www.reddit.com/r/MotoG/comments/6e1cc4/moto_g_amazon_edition_remove_app_that_displays/|'''Moto G Amazon Edition - Remove app that displays ads with one simple command'''] “
and replaces the adb shell command
pm uninstall -k --user 0 com.amazon.phoenix
with
pm uninstall -k --user 0 com.motorola.ccc.ota
you will cease the update notifications!!
Further explanation: com.motorola.ccc.ota is the system/programmer name of “motorola update services “ which you see if you go to Settings>>Apps & notifications>>3 dots (Top right corner)>>Show system>> ( Scroll down) till you get "Motorola Update Services app".
Notice thuogh that this is only a workaround of the real problem (of failing to upgrade your firmware)
and that you will not get a firmware updated to the newer versions (of android 7 - Nougat and so on).
HTH
Guy