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Updated How to upgrade 4G extension firmware (markdown)

GNU 2023-07-23 14:16:51 +08:00
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How-to-upgrade-4G-extension-firmware.md

@ -187,4 +187,19 @@ even if you switch id from 9011 to 9001 ,mmcli may still not able to see the 4G
Therefore, there are risks involved in flashing the 4g ext, and it is necessary for you to have a certain understanding of these background information. During the testing process, it is also not possible for me to test whether all SIM cards worldwide can easily connect to the internet through **usb0**.
# Useful AT commands
* check sim card status
```
echo -en "AT+cpin?\r\n" |sudo socat - /dev/ttyUSB2,crnl
+CPIN: READY
OK
```
* check signal quality
```
echo -en "AT+CSQ\r\n" |sudo socat - /dev/ttyUSB2,crnl
+CSQ: 20,99
OK
```