There's a way. If u dont want updates, mess up your devices CSC code. For example. If u are on an ATT Device, install a verizon firmware using Patched Odin. The only caveat is that you have to use a firmware with similar bootloader version as u cant downgrade the bootloader. This would prevent the phone from updating as the CSC doesnt match. I did this with a friends Note8, it was a Verizon phone on Cricket wireless with Sprint software. It never updated until I installed XAA software on it, which is U1 Unlocked firmware.
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