[Alcatel Idol 4S Questions & Answers] sloshnmosh:
First off I must appologize,

I did read your post and do understand that you have followed previous steps/advice given by others and that you were looking for a possible solution without rooting the device.

The links I provided for running ADB commands were not directed towards you, I only posted them there for any users that may have a rooted device and were having trouble removing a system app as theyare sometimes installed in more than one location and will be in a read only file.

I sincerely hope I didn't scare you off or dismiss you in any way and I will offer as much help as I can.

I did see that Alcatel may have changed a few things since I last messed with the stock OS and it that may be the reason(s) none of the techniques you have tried have kept the adware laden update from reinstalling.

I do own 2 Alcatel Idol 3's (I used to have 3 but gave one away).

On one of the devices I have original the Lollipop stock Alcatel OS but it is rooted.

I use this device for testing/analysis. A guinea pig device as you will.

On the other I have flashed a custom Lineage OS ROM without any Google Play apps installed and only a few apps. (Most of them open source that I personally inspected).

One thing that I have not seen any users mention regarding trying to block the Alcatel updates is certificates.

I have not tested this theory but it may be possible to block Alcatel from updating by disabling some trust certificates and clearing out the certificate cache in Settings/Security.

I found a very useful app on the Play Store that doesn't require any permissions that gives a good overview of the trust certifactes installed on your device called: BlueBox

https://play.google.com/store/apps/details?id=com.bluebox.labs.trustmanager&hl=en

It will show you if there are any trust certificates that are depricated. expired or concerning as well as giving the country of origins.

Again, I have not tested the theory that disabling one of these certificates would stop an update from Alcatel but it should if one of those certs is used to make a secure connection to their servers.

Also I do remember the supervisor from Alcatel whom I spoke to on the phone regarding these unwanted updates recommended clearing the certificate cache in Settings/Security after uninstalling the updates.

Again, this was several months ago and Alcatel may have made some changes to that as well.

I would set my device to "Airplane" mode and try removing the updates again but this time be sure to clear the certificate cache in Settings/Security Clear credentials.

If the updates still return then maybe download and run the Bluebox Trust manager and disable any "depricated" and/or "concerning" trust certificates that it lists and see if that works.

If all else fails you could disable any trust certificates from China using the BlueBox app as a guide.

Note that the BlueBox Trust Manager app has the abilty to disable Trust certificates that you choose automatically on a rooted device but for a non rooted device such as yours you will have to manually disable them in Settings/Security Trusted Credentials.

It may help if you wrote down the name and serial number of the certificates that you want to disable that are shown by the BlueBox app for when you go to the Trusted Credentials in Settings to make it easier.

Let me know if that works at all and if not I will dig up my Idol 3 with the Alcatel OS on it to try and assist you further.

Again I am sorry you felt that you weren't receiving the help or information in my previous posts and I will try and make up for that.

Awaiting your results.