Difficulty enabling USB data transfer on Android 12 tablet - Android Q&A, Help & Troubleshooting

I just bought a Lazmin112 FHD 1920x1080, 32GB , 7inch Android 12 tablet although it appears to be some kind of wholesale thing that's available from literally dozens of different retailers. If it helps it shows up as a Model number P50 under About tablet.
This is my first exposure to Android 12 so I'm not sure whether I'm seeing differences in Android 12 from Android 11 or if the differences are specific to this tablet.
The bottom line is that I can't connect to the device via usb, the PC can't see the usb data space nor does adb list any devices attached.
I've enabled Developer options but many of the controls I'm familiar with are not present. I've enabled USB debugging but there is no default USB usage setting or any other USB related setting other than USB debugging.
The documentation, such as it exists, merely says "USB just only be used for data transmission".
Does anyone have any kind of clue as to how to deal with this?

You could try swiping down to get to the notifications area and tap on the "Connected as media device" notification and then changing it to PTP mode. That sometimes works for USB debugging.

There are various reasons why your Android device is not able to transfer data. Though Android File Transfer is an effective application for transferring data, the restrictions limit the activities. Mac doesn't support media transfer protocol (MTP) for transferring files from Android to Mac. So, it is essential to install Android File Transfer on your Mac to transfer files from Android to Mac. When Android File Transfer could not connect to the device, you might find that Android File Transfer is not working properly.
Here are the common reasons leading to unresponsive Android File Transfer on your Mac:
The file transfer feature is not enabled on your Android mobile/tablet.
Your USB cable is defective.
Your Android device or Mac computer is not compatible with Android File Transfer.
Your Mac's USB port got damaged.
You have installed Samsung Kies or Samsung Smart Switch on your Mac.
Regards,
J Wick

Thanks for the input.
As it turned out I was using the cable that came with the tablet and apparently it's either damaged or more likely it's a charging only cable because as soon as I used another cable I did finally get the connected as media device notification and was able to view the file structure from the PC.
Thanks again.

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Most other android devices i know of you can plug em in with a USB cable and it shows up on the computer like a USB memory stick. Thus far with every setting i try the prime shows up as like a camera or MTP device or whatever, makes it a pain to transfer files and it blocks some system files.
Am i missing something here or is there a way to make the prime just show up as a USB memory stick on my computer?
Have you installed the USB driver from ASUS?
http://support.asus.com/Download.aspx?SLanguage=en&m=Eee+Pad+Transformer+Prime+TF201&p=20&s=16
Mine shows up as an MTP device but also shows the drives and they are drag and drop accesible.

[Q] TF101 Media Device(MTP) or USB Mass Storage Device

Hi All,
I have a rooted TF101 (ICS)
Android V:4.0.3
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I have an interesting issue. I noticed whenever I connect my TF101 it always connects to pc as Media Device, However I wanted it to connect as USB Mass Storage device so that it could have a drive letter associated with it.
When I searched on the device I see that at following location
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Click on the bar at the top right, it shows another option
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Click on that
It shows a pre selected option Media Device(MTP), I tried to uncheck it but seems like there have to be one selection on this page that needs selection. I was wondering if somehow both selections are unchecked then it would allow the device to connect as USB Mass Storage? any light on this?
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Debug USB

Hi, when I connect my Poco with USB cable to my computer the installation of the drivers are ok, windows found the device.
But when i open it the Poco's window is completely white and empty: no files, no folders...there is not the SD card...
I would like to transfer flies from pc to phone by USB connection but it seems impossibile!!
The error message is: "the device has stopped responding or has been disconnected"
P.S.
Debus USB activate, windows 7
Did you change USB connection mode from charging to transfer files? You know, after tapping on notification appearing after USB connection?
Another issue (encountered by me), even with correct connection mode, Pocophone device in Windows 10 (maybe in Windows 7 is the same) remains empty if connected thru an additional USB3 hub. Direct connection to one of USB ports in PC case works flawlessly.
katoda_ltd said:
Did you change USB connection mode from charging to transfer files? You know, after tapping on notification appearing after USB connection?
Another issue (encountered by me), even with correct connection mode, Pocophone device in Windows 10 (maybe in Windows 7 is the same) remains empty if connected thru an additional USB3 hub. Direct connection to one of USB ports in PC case works flawlessly.
Click to expand...
Click to collapse
Oh kat, I've got it!! :good:
The different thing I have done from this morning is to disable and after enable developer option...now I can see the 2 folders on the PC in the Poco window: SD memory and internal memory!!
Don't know why...but works!!
Thank You so much!! :good:

Question Problem with file transfer on windows

Does anyone have issues with transferring files to a windows PC? I plug my phone in and under USB preferences its grayed out. I've tried the xperia companion and it seems like my device isn't recognized because the option to browse my files is grayed out too.
It happened to me because I was using the usb-c cable that comes with the same phone.
What I did was look for another usb-c cable that I had at home (from my Xperia 5) and when plugging it into Windows 10/11 it recognizes it perfectly and on the phone you put "Allow" and you can transfer files.
Apparently the cable that comes by default in the box with the Xperia 1 Mark III does not support data. Greetings
akitomartin said:
It happened to me because I was using the usb-c cable that comes with the same phone.
What I did was look for another usb-c cable that I had at home (from my Xperia 5) and when plugging it into Windows 10/11 it recognizes it perfectly and on the phone you put "Allow" and you can transfer files.
Apparently the cable that comes by default in the box with the Xperia 1 Mark III does not support data. Greetings
Click to expand...
Click to collapse
The cable that came with my Phone (Phone bought from sony partner from official site) wrk for file transfer without problem (under win 10 e win 11).
Maybe different market, different cable bundled in?
Yeah, I also bought it from the official Sony store via Amazon. When I plugged it in and saw that it didn't work for data (or for recovery via Xperia Companion) I started googling and investigating and the same thing happened to several users. Mine is the UK Bundle version.
It seems a normal problem on different phones. Usually, it will be solved when we change an offical USB cable. Or if your computer and your phone are in the same network, you can also try WiFi connecting. A third-party tool like Coolmuster Android Assistant allows us to do that. With its help, we can do that data transfer via WiFi connecting directly.
use adb push/pull commands much better.
I have the same problem in Linux, enabling USB debugging in developer options sometimes solves it. Very flakey however, its 10 years since I had as much trouble connecting a phone to a PC

Question Would S22+ MTP & ADB be locked by carrier?

I got a second hand S22+ with PET country code. I would like to transfer some music files to the S22+.
The phone only show charging but no notification pop-up when connect to PC. (installed Samsung USB driver 1.7.59.0, tried connecting by USB c to c cable from Note10+, USB a to c from Zenfone6)
Factory Reset not help, still only show charging.
When I am thinking whether it is hardware issue, I try to adb connect <phone ip>:5555 , it shows "No connection could be made because the target machine actively refused it. (10061)"
So would carrier locked MTP & ADB?
(p.s. for other behavior) I just try to connect the S22+ to a Switch Lite, S22+ is giving power to Switch Lite and can see USB Settings notification and grey out transfer options (I think it is expected like other phone do)
Do anyone with CSC PET also have no USB MTP transfer and ADB connect?

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