There is a MUCH better way to disable automatic system updates. First you need to enable "Developer options" (please Google to find out how to do that), and then turn off "settings / developer options / Auto update system". Those of us using US Unlocked versions of the S9 and S9+ in Australia and New Zealand have had to disable the most recent firmware update because it bricks our phones. The only fix is to revert to the previous (working) firmware version and disable auto updates.
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