Help, a question from the fifth edition, related to the network, I also send some Pi coins.
After the first crack, it seems I applied an E→3G patch to the patches, and then in places with a good signal, there was 3G network, which is H network or 3.5G. Later, due to various reasons, I had to reformat the phone, and after that, applying the 3G patch to the patches no longer brought up 3G network. My SIM card itself is a China Unicom 2G card, 500M, called Xinshili Mi XX. I want to ask how to expand the phone's network to 3G without changing the card.
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