This is the best I could do for hunting down an older version of firmware for NU7100 (filename T-KTM2LAKUC.zip) with version 1152.7
This was posted to the site below October 30, 2018.
https://drivers.softpedia.com/get/TV-HD ... 52-7.shtml
If this needs to be removed because it's not an official Samsung download URL let me know and I will do so promptly.
If I flash my 3.5-year-old TV with that and disable automatic updates, I wonder if I can remove recommended apps permanently.
Waiting on advice before doing anything.
Found an even older version of T-KTM2LAKUC.zip with version 1103.4
https://drivers.softpedia.com/get/TV-HD ... 03-4.shtml