I use a Raspberry Pi 2 model B with a wireless dongle usb realtek, with the current raspbian version show the error 'No wireless interfaces found'
I solve this problem using a old version for raspbian, can download it from https://downloads.raspberrypi.org/raspbian/images/raspbian-2019-04-09/
So, this is my reply from waveshare helpdesk.
I'm only posting it here in case it is any help to so.done else with the same problem, because I simply don't understand instructions like these and neither does my 9yr old son.
I plan to return it for a refund.
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There is a limited set of resolutions available in RPI out of the box. You can't really expect any screen to just work without knowing that it's supported by drivers.
You can figure out which one works experimentally, or by identifying the screen (by its docs) and seeing if it's listed as supported. There is also a more involving options of tweaking the ...