Qualcomm Usb Composite Device 901d ❲Linux❳

If an Android phone has encountered a software corruption issue (often caused by a failed OTA update or an interrupted flashing process), it may not boot into the main Android OS. Instead, it sits in a low-level state. When plugged into a PC, Windows might detect it as "Qualcomm USB Composite Device 901D" rather than a standard storage device or MTP device. This is a sign that the phone is alive but needs a firmware re-flash via tools like QPST or QFIL.