Qxdm Failed To Create Diag Service

"Failed to create diag service" typically indicates a resource conflict where the diagnostic port is locked or the underlying communication service (QUTS) has hung Error Overview

: Sometimes the diag service fails due to expired or out-of-sync licenses. Use the qpm-cli --license-activate QUTS command to refresh your credentials. 3. Device Diagnostic Port Configuration qxdm failed to create diag service

| Symptom | Check Command / Action | Expected Result | |---------|------------------------|------------------| | No DIAG port in Device Manager (Windows) | Check USB descriptor: lsusb -v \| grep -A 10 "Diagnostic" | Interface class 0xFF, subclass 0xFF, protocol 0x23 | | Port present but no response | Send raw DIAG_CMD_VERSION_QUERY (0x00) via serial | Reply with version, max packet size | | DIAG_CMD_SUBSYS returns error | Trace using internal UART log (if accessible) | Look for diag_comm_subsys_handler: svc not registered | | Modem reset on DIAG command | Check QDSS (Qualcomm Diagnostic Subsystem) logs via JTAG | DIAG task exception or null pointer dereference | "Failed to create diag service" typically indicates a