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I've had this happen to me with 2 causes:
One time was just a bad ground connection - especially tricky on the 'tropicalised' gooped pw4. I found I can see the serial output with gnd disconnected but it won't talk in the other direction..
But also - I bought a cheap 1v8 TTL adapter from aliexpress and it doesn't seem to send my keystrokes properly, so I've gone back to my ftdi one with a voltage regulator.
Good luck.
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