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Updated How to upgrade 4G extension firmware (markdown)

GNU 2023-09-09 12:30:30 +08:00
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How-to-upgrade-4G-extension-firmware.md

@ -196,6 +196,14 @@ https://techship.com/faq/how-to-automated-connection-establishment-with-sim7600-
# Useful AT commands
* check firmware version
```
echo -en "AT+GMR\r\n" | sudo socat - /dev/ttyUSB2,crnl
+GMR: LE20B04SIM7600G22
OK
```
* check sim card status
```
echo -en "AT+cpin?\r\n" |sudo socat - /dev/ttyUSB2,crnl