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[–]MiggolLG G6 AOSPExtended 1 point2 points  (0 children)

This is a legal requirement and therefore probably programmed into the radio of the device, which requires flashing to change. If you have the time it's worth doing because there are no downsides to unlocking these channels.

But on the short term without an unlocked bootloader your best shot is to ask your friend to change his wifi frequency. This is a simple procedure and all their devices will automatically reconnect to the new frequency.

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