EM75XX -- Restoring Modem AT Command Port (After Using Wrong Commands)
Posted: Wed Feb 26, 2020 6:16 pm
Using the incorrect AT Commands to change the composition of an EM7565/EM7511/MC7411 mode to QMI and/or MBIM is a common mistake which results in removing the modem's AT Command port.
Most generally this occurs when using the AT Commands on the EM7565/EM7511 that apply to the EM/MC74XX modems. The difference in the command as very minor (i.e., 1 digit).
For instance, to place a MC7455 modem in MBIM composition uses the AT Command:
where the EM75XX requires:
The modem can fixed while installed in or behind a router running OpenWRT/GoldenOrb/WiFiX firmware.
Using PuTTy, login the router using the routers IP address, generally 192.168.1.1
Once in, run the following command:
Then repair the config with:
Then place the modem in MBIM composition with the follow commands:
And, that should do it.
Most generally this occurs when using the AT Commands on the EM7565/EM7511 that apply to the EM/MC74XX modems. The difference in the command as very minor (i.e., 1 digit).
For instance, to place a MC7455 modem in MBIM composition uses the AT Command:
Code: Select all
AT!USBCOMP=1,1,1009Code: Select all
AT!USBCOMP=1,3,1009The modem can fixed while installed in or behind a router running OpenWRT/GoldenOrb/WiFiX firmware.
Using PuTTy, login the router using the routers IP address, generally 192.168.1.1
Once in, run the following command:
Code: Select all
echo 1199 9091 > /sys/bus/usb-serial/drivers/option1/new_idCode: Select all
picocom -b 115200 /dev/ttyUSB0Code: Select all
At!entercnd="A710"
At!usbcomp=1,3,1009
At!reset
And, that should do it.