Hard factory reset
I have absolutely no access to a computer. Is there another way I can reset my iPhone11?
iPhone 11 Pro Max, iOS 13
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No. you need to use a mac or windows PC with iTunes.
This article explains how:
If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support
If you have a backup you can restore it from that
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
Hope this helps!