Holy cow, yes, that's a very mean mistake. Sorry for my abstinence, but I couldn't think of why it couldn't work, I checked your photos, especially the RX / TX lines and everything around the CH340G, I couldn't see any errors. And the connection with the USB worked. But now it is of course clear, because the UART, the baud rate in particular, of course, depends on the clock.
I am very happy that you found the bug and it works now.
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