how to undo/delete system update on Samsung J3 Emerge (Virgin Mobile)

I just got this phone in October, first thing I did was turn off the automatic system updates, well, I woke up and my phone tells me it downloaded a system update, and the "lock" was unlocked, even though I never turned it back on and would check periodically to see if it was still off.

This update is eating a lot of memory, I just deleted a 436mb game called Extreme Landings from the PlayStore, somehow I only got 48mb memory back (ROM went from 363 to 401)

Anyway I never had problems with updates when I had an LG, so what do I do? Can I remove a system update without a factory reset? I'm poor so I dont have a laptop to back up stuff on, please help (or kill me, also helpful)

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