Request for Support: RM500Q-GL Modem Not Detected by Host

IoT Modules 5G Module
1

Dear Quectel Support Team,

I hope this message finds you well. I am writing to seek your assistance regarding an issue with my Quectel RM500Q-GL modem.

The modem was functioning perfectly, but it has suddenly stopped being detected by the host system. Despite this:

  1. There are no signs of hardware damage.
  2. The modem’s indicator light continues to blink, suggesting it is powered and operational.
  3. However, the modem’s COM ports are no longer visible on the host system.

I have already attempted the following troubleshooting steps:

  • Reconnected the modem to the host system.
  • Tried different USB cables and ports.
  • Verified power supply integrity.
  • Restarted the host system and ensured all drivers were up-to-date.

Despite these efforts, the issue persists.

Could you please assist me in diagnosing and resolving this problem? If you require additional information, such as system logs, firmware version, or specific diagnostic steps I should perform, kindly let me know.

Thank you for your support. I look forward to your response.

Best regards

2

Dear @NR5GSA
You can measure diode characteristics using a multimeter, anout USB pin like VBUS，DP，DM.
Check if have hardware issue.

1 Like
3

Hi @Silvia,
Thank you for your reply. After taking the chip out, cleaning it, and putting it back, it started detecting again. However, it now only reaches the RRC CONNECTION REQ stage. My other Quectel module (with the same AT configurations and model) connects to the internet without any issues.

4

Dear @NR5GSA
Did you mean that your module can’t register anymore? Is it possible to capture log on your side?