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readme: note proper query usage

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Signed-off-by:  Eric Callahan <arksine.code@gmail.com>
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Eric Callahan 2023-08-28 10:18:47 -04:00
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@ -99,6 +99,11 @@ with Katapult again.
flashtool.py -i can0 -q
```
**NOTE: A query should only be performed when a single can node is on
the network. Attempting to query multiple nodes may result in transmission
errors that can force a node into a "bus off" state. When a node enters
"bus off" it becomes unresponsive. The node must be reset to recover.**
For USB/UART devices:
Before flashing, make sure pyserial is installed. This step only needs to
be performed once: