# USB device not listed after sending the wrong command(CEREG) **URL:** \ **Category:** HL78\ **Created:** [March 19, 2024, 5:42am UTC](https://forum.sierrawireless.com/t/usb-device-not-listed-after-sending-the-wrong-command-cereg/31848 "2024-03-19T05:42:50Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![bolt](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/bolt/32/8529_2.png) [@bolt](https://forum.sierrawireless.com/u/bolt)\ **Post date:** [March 19, 2024, 5:42am UTC](https://forum.sierrawireless.com/t/usb-device-not-listed-after-sending-the-wrong-command-cereg/31848/1 "2024-03-19T05:42:51Z")
I have trouble communicating with HL7810 on my MacBook laptop. I just registered to Airvantage for first use. HL7810 didn’t respond after I sent AT+CREG=5(5 is the wrong parameter. my mistake). I did reconnect the cable to reboot, but not showing up in “/dev/tty.\*”. Could I H/W reset without AT communication? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [March 19, 2024, 5:57am UTC](https://forum.sierrawireless.com/t/usb-device-not-listed-after-sending-the-wrong-command-cereg/31848/2 "2024-03-19T05:57:10Z")
how about connecting to Linux? (anything showing in dmesg?) how about connecting to Windows? Is there anything coming out in UART? ---
**Author:** ![bolt](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/bolt/32/8529_2.png) [@bolt](https://forum.sierrawireless.com/u/bolt)\ **Post date:** [March 19, 2024, 6:44am UTC](https://forum.sierrawireless.com/t/usb-device-not-listed-after-sending-the-wrong-command-cereg/31848/3 "2024-03-19T06:44:00Z")
dmesg from Linux: > [10194644.620864] usb 5-1: new full-speed USB device number 10 using xhci\_hcd > [10194644.847144] usb 5-1: New USB device found, idVendor=216f, idProduct=0051, bcdDevice= 0.00 > [10194644.847151] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > [10194644.847154] usb 5-1: Product: U-Boot 2012.10 > [10194644.847156] usb 5-1: Manufacturer: Das U-Boot > [10194644.847158] usb 5-1: SerialNumber: 0000000 > [10194644.900988] cdc\_acm 5-1:1.0: ttyACM0: USB ACM device > [10194647.626073] usb 5-1: USB disconnect, device number 10 Nothing changes on Windows ![windows](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/f/f8500ed57c2b8809150341b32b1e4b6bf9629250.png) ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [March 19, 2024, 7:02am UTC](https://forum.sierrawireless.com/t/usb-device-not-listed-after-sending-the-wrong-command-cereg/31848/4 "2024-03-19T07:02:35Z")
Is there anything coming out in UART? For comparison, do you have another working HL7810 to connect to linux and Windows? ---
**Author:** ![bolt](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/bolt/32/8529_2.png) [@bolt](https://forum.sierrawireless.com/u/bolt)\ **Post date:** [March 19, 2024, 8:48am UTC](https://forum.sierrawireless.com/t/usb-device-not-listed-after-sending-the-wrong-command-cereg/31848/5 "2024-03-19T08:48:04Z")
here is dmesg log with working HL7810 [10202244.619945] usb 5-1: new full-speed USB device number 13 using xhci\_hcd [10202244.837304] usb 5-1: not running at top speed; connect to a high speed hub [10202244.854916] usb 5-1: New USB device found, idVendor=1199, idProduct=c001, bcdDevice= 0.00 [10202244.854921] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [10202244.854924] usb 5-1: Product: Sierra Wireless IoT Device [10202244.854926] usb 5-1: Manufacturer: Sierra Wireless, Inc. [10202244.854927] usb 5-1: SerialNumber: V1.00 [10202244.892999] cdc\_acm 5-1:1.0: ttyACM0: USB ACM device [10202244.895970] cdc\_acm 5-1:1.2: ttyACM1: USB ACM device [10202244.898974] cdc\_acm 5-1:1.4: ttyACM2: USB ACM device [10202244.901978] cdc\_acm 5-1:1.6: ttyACM3: USB ACM device ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [March 19, 2024, 9:06am UTC](https://forum.sierrawireless.com/t/usb-device-not-listed-after-sending-the-wrong-command-cereg/31848/6 "2024-03-19T09:06:51Z")
strange that the VID and PID are different compared to previous one ---
**Author:** ![bolt](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/bolt/32/8529_2.png) [@bolt](https://forum.sierrawireless.com/u/bolt)\ **Post date:** [March 19, 2024, 9:42am UTC](https://forum.sierrawireless.com/t/usb-device-not-listed-after-sending-the-wrong-command-cereg/31848/7 "2024-03-19T09:42:06Z")
I have two HL7810 devices. 1. ID of the working device. > idVendor=1199, idProduct=c001, … 1. ID of the not working device.(doesn’t respond after I’ve sent the wrong command) > idVendor=216f, idProduct=0051, … ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [March 19, 2024, 10:05am UTC](https://forum.sierrawireless.com/t/usb-device-not-listed-after-sending-the-wrong-command-cereg/31848/8 "2024-03-19T10:05:32Z")
Is there anything coming out in UART? I used the following method to download FW over USB in HL7800, not sure if you can recover your faulty module like this: 1. AT+SWITRACEMODE=RnD → this is important as by default, there is no CLI port (just for any accident, you can still use AT command via CLI port) 2. at+cfun=1,1 3. AT+KUSBCOMP=1,1,2,3 4. AT+CFUN=1,1 5. Assume USB port enumerated are COM97 99 107 where COM 107 is the USB AT port 6. double click the HL7800.4.4.13.0.exe 7. choose 2 → USB(YMODEM) 8. choose bootloader port COM96 (this might not be known at the first time running this program as when normal boot, you will not see this port) 9. choose port to download as USB AT port which is COM107