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9 changes: 8 additions & 1 deletion docs/usage.md
Original file line number Diff line number Diff line change
Expand Up @@ -74,7 +74,14 @@ The tool offers also the ability to flash SSL certificates to a module:
./arduino-fwuploader certificates flash -b arduino:samd:nano_33_iot" -a COM10 -u arduino.cc:443 -u google.com:443
```

or you can specify a path to a file with `-f` instead of the URL of the certificate
or you can specify a path to a file in `.der` format with `-f` instead of the URL of the certificate

Due to a limitation on the handling of certs in the NINA modules, when `certificates flash` command is launched, all the
previous certificates are going to be erased. To overcome this it's required to upload them all together:

```
./arduino-fwuploader certificates flash --url arduino.cc:443,google.com:443 --file ~/Downloads/my_self_signed_.der -b arduino:mbed_nano:nanorp2040connect -a /dev/ttyACM0
```

### Command line options

Expand Down