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[Update] Jailbreaking on iOS 14.3 and below is now available. This article got an update here.
Thanks to the recent exploit on iOS 14.3 and below, now we can use Plankfilza, aka Filza built by brandonplank, to modify system files.
This tutorial is for you who have a way better 3G signal than 4G or don’t have a 5G network in your local area, whatsoever, who wants his 3G back.
3G option disappears when carriers enable 5G in iOS system profiles. So with the help of Filza, you can disable the 5G option, then your 3G switch will come back.
I have tested it on my device: iPhone 12 mini on iOS14.3 RC(18C65) with China Unicom v45.2 and 3HK v45.0 working. And I’m sure this method will still work, after the actual jailbreak coming out.
Want your lightning-fast 5G back? You can change the value of the “Show5GSwitch” back to YES, then reboot, or delete the whole “Overlay” folder, then reboot, let the system rebuild the directory for you.
Ref:「Tutorial」Enable awesome 2G / 3G / 4G Toggles by u/Imvbs on Reddit.
— Feb 18, 2021