Update 20_zigbee2mqtt-fails-to-start.md (#2440)

* Update 20_zigbee2mqtt-fails-to-start.md Rare case of having same /dev/serial/by-id device. * Update 20_zigbee2mqtt-fails-to-start.md #2440 (comment) Not sure if I done it correctly. * Update 20_zigbee2mqtt-fails-to-start.md --------- Co-authored-by: Koen Kanters <[email protected]>
Koenkk · Jan 2, 2024 · da116bb · da116bb
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@@ -186,3 +186,11 @@ The correct revision is: **E** like shown below.
 ![cc26xr1_revision](../../images/cc26xr1_revision.png)
 
 All earlier version are not supported (these are development boards). Return this board to the seller immediately.
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+## Multiple cheap USB-UART
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+If you have multiple devices connected that are running cheap USB-UART converters (CH341) they may be indistinguishable to your system, since they all possibly have the same idProduct, SerialNumber etc. so they will share the same /dev/serial/by-id.
+The easiest solution is to change one of your devices to something with a different uart-usb converter. The second solution would be swapping the whole converter or adding external EEPROM memory to a chip that does not have one (like CH341) so you would be able to add a serial number.
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