adbd is disabled on the device by default and must be explicitly enabled before use.
Introduction
Describes an alternative procedure to switch devices into
EDL mode using ADB. This procedure is only applicable if the device has
a preloaded image.
At a high level, the workflow includes the following:
- Set up the host system with required tools (QUD, ADB)
- Connect device to ADB
- Switch device to EDL mode
Install required packages
QUD is required to ensure the host system can properly detect and
communicate with the Qualcomm device over USB in Emergency Download
(EDL) mode.
-
Clone the
qud GitHub repository:
-
Ensure the install script is executable:
-
Install the QUD driver:
ADB is used to communicate with a running device and is required to trigger a reboot
into EDL mode from the operating system. It provides a convenient way to transition
the device into the correct state for flashing without manual intervention.
-
Install
adb on your host system using the system package manager:
-
Verify if
adb is installed on your system:
-
The
adbd service is disabled by default. A one-time setup is required to
enable the service before adb can be used.
-
Connect to the device by following the
Connect via UART guide.
-
Create the file
/etc/usb-debugging-enabled to enable adbd.
-
Configure the
adbd service to start automatically.
Connect to ADB
-
Connect the device using the USB Type-C cable to the host computer.
-
Ensure that the device is recognized as a device by
adb:
-
Connect to an
adb shell:
Switch device to EDL mode
-
In the
adb shell, switch the device to EDL mode:
-
Verify if the device is in EDL mode:
