[BPI-R4]Scrambled UART output with Debian image

What keyboard? There is no keyboard attached. I’m using the UART headers alone. Is anyone reading my posts?

Could you please try ftdi adapter?

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I’ll try; I think I have one, I’ll have to find it.

To clarify, there is no keyboard on the Pi either - I’m SSH’d into the Pi over my LAN. This was probably not obvious. I’m thus using my regular laptop keyboard over SSH to send commands to the R4 and getting the garbage back.