I have no idea how data flashing works on waveshare board, but seems on original one you need to use jumper.
could it be the case?
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Every one I’ve use had a switch or jumper to put it in gadget mode to flash the emmc or sd, and you had to remove it for the device to boot right.
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If you stuck the stock antenna to the chassis like the manual says, then that’s the problem. The case interferes with the antenna and causes low performance. Use some thick double sided tape to give it 2mm of separation or get a externally mounted antenna.