Hello Team,
I am facing an issue with EC200UCNAA modules after updating firmware and running QuecPython scripts.
Issue Details:
Some modules are now stuck and only show the following port in Device Manager:
SPRD U2S Diag
Other ports such as AT port, NMEA port, and modem ports are not appearing.
Before this issue, the modules were working normally.
Observed Behavior:
- SIM not detected & no network registration on affected modules
- Modules only show Diag port
- AT commands cannot be accessed
Troubleshooting Done:
Verified VDD_EXT = 1.8V
STATUS pin remains low
Tried pulling BOOT pin high (1.8V test)
Tried power cycling and USB re-plug
No AT/USB ports — only DIAG
Unable to enter fastboot mode
What I Need Help With:
Kindly guide me on:
- How to recover modules stuck in Diag-only mode
- Procedure/tool for re-flashing bootloader/firmware in DIAG mode
- Any known issues related to QuecPython update causing this behavior
Request:
If possible, please share:
- Correct recovery steps
- EC200UCNAA SDK
- Required tools/software (QFlash, etc.)
- Boot key/USB boot instructions
This issue is urgent for our development. Any help is greatly appreciated.
Thank you in advance!