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Upgrading the hardware to 5G

Hi , I like small compact phones like A300 series. Can it be possible to upgrade the motherboard to include 5G bands? Right now there are no compact 5g phones on the market.

Update (01/16/2022)

Also going to send this question to the Sony Xperia compact community

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Sony Xperia for a Samsung A3 phone? What phone do you have?

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