Help . ¿How To Stop a TMobile ' Software Update' ? - Samsung Galaxy S9 Questions & Answers

I am running a Tmobile New S9 Only on Metro PCS for 1.5 years , [which is now Metro by Tmobile ] .
It was purchased new and never used on Tmobile.
1]Works great SM960U.
2]Still running Android 8.0 [ G960USQU1ARBG ]
I never' updated 'kept original factory software .
3]Security patch and software from Feb 18 2018
PROBLEM- Now I see aggressive full page Alerts for a new download from Tmobile in the phone overnight with options to install now or tomorrow .
IF I had touched bottom of phone by mistake
it would have loaded .
I clicked away from it .
How do I stop it ?
Start the download and shut off the phone ?
On a much earlier download , I clicked by mistake and did that with no ill effects -except stuck in notification window.
BUT this one keeps coming back as full screen takeover once a week or so .
Not compatible with Android 8.0 probably.
Don't want it , don't want Android 9.0 phone works great now.
Any ideas ? Thanks.

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So i've decided to go for a custom rom.
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