How to use ADB to enable & disable Diagnostic (DIAG) mode on Qualcomm



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00:10
In this video tutorial, I’ll be explaining how to enable and disable Diag mode or

00:16
diagnostic mode on a Qualcomm Android device using ADB. Diag mode enables you perform advanced

00:22
functions like writing or restoring qcn, it can also allow you to backup qcn. Writing

00:30
IMEI etc. For you to enable diag mode, your phone needs to be rooted. We have a guide on how to

00:35
root using magisk. You also need to have installed your Qualcomm USB drivers. We

00:40
have a guide on how to do that also. You need to have setup ADB on the PC, we have a guide for

00:45
that. You need to have the Qualcomm Android device and USB cord. Now, once you have

00:51
these in place, you launch device manager and then you leave the phone powered on

01:06
once in device manager you connect the phone to the PC

01:11
don’t forget the phone should be powered on and take note of what it gets

01:18
detected as. I have a detection under Portable Devices (Pi Pro). Now, to

01:27
enable diag mode, you launch command prompt. This is how I’m going to

01:33
launch command prompt

01:40
and then you jump to the adb directory although for some devices /

01:45
laptops you just hold down shift and then right-click and then select open

01:51
command prompt but I have power shell here so I’m not going to go through that approach. I don’t have

01:55
command prompt here so I’m going to go
through this method. Now, I’m going to copy my

02:00
adb address folder by right-clicking, selecting copy address then come here (to type) cd

02:07
*space* right-click to paste the address

02:12
I’m going to run that again… and then I press ENTER so now I’m in ADB directory

02:21
so I’m going to run this command adb devices to be sure I have a connection so

02:29
I’ve list of device detected. Now I run adb shell and then su . Now at

02:41
this point, if you are doing it for the first time, you might get a prompt on

02:44
your device to either allow ADB or to allow shell root access. Either ways, you grant

02:52
okay. Now, you’re going to run this command to

02:56
boot into diag mode. I’ll just copy it here; setprop sys.usb.config diag,adb

03:06
alright then you tap enter so that is

03:13
going to enable diag mode. To confirm, you go back to device manager. Its

03:18
going to refresh and then you should have an entry like this Qualcomm HS USB Android DIAG

03:26
901D so this is your device in diagnostic mode. Now to revert, that is to

03:33
take the device out of diagnostic mode, you run the same commands if you’re starting

03:39
afresh but if you are where I am currently, you just paste the same command

03:44
but instead of diag, you change to mtp. it’s the same command / procedure. The only

03:51
difference is mtp or diag. Since I’m in diag mode, I want to revert

03:56
back to the previous setting which was mtp (just change diag to mtp) and tap Enter

04:04
oh sorry, I have to run the commands afresh so adb devices adb shell su and then

04:23
I paste the command but change to mtp and then enter so I check device manager

04:38
again. I’m good, I have my device detected under portable devices once again so that’s

04:45
how to enable or disable diag mode or diagnostic mode on a Qualcomm Android

04:50
device using adb

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