Before it crashed? I hadn't run any AT instructions in probably 6-12 months since getting it set up initially. After it crashed? The only commands I ran were the ones listed in How-To: Installing Vanilla OpenWRT on GL X3000
echo -e "AT+QCFG=\"usbnet\",0\r\n" > /dev/ttyUSB2
echo -e "AT+QCFG=\"data_interface\",0,0\r\n" > /dev/ttyUSB2
After that, the only commands I've run were your commands to try and debug it, and then I reran those commands once I re-flashed OpenWRT this morning, to keep my system usable.