Database Users

2x A7 tablets - adb does not recognize one of them

Hi all,
I'm hoping someone may have some suggestions or thoughts since I'm completely stumped.
I have two Elocity A7 tablets running Dexters Mod, identical versions.
Many months ago I modifed the first tablet to have adb via usb working perfectly on my desktop and laptop (both Win7x64) using the following very helpful links:
http://forum.xda-developers.com/archive/index.php/t-948499.html
http://forum.xda-developers.com/showthread.php?t=974745
I've recently attempted the same mod with the second A7 tablet however adb does not display the device.
Windows recognizes the tablet in device manager correctly, indicating to me that usb slave mode is functioning. If I unplug the cable and plug it into my first tablet, adb recognizes it instantly which rules out incorrect Windows configuration. Device manager recognizes both tablets in the same manner.
USB debugging is enabled on both tablets.
Greatly appreciate if anyone has some ideas or suggestions.
Thanks!!

[Q] adb Mode/usb developing mode does not work

I'm using the Asus Google Nexus ToolKit V3.8.2 (donated version).
With my first N7 I was able to unlock and root.
Now I exchanged it against the N7 3G (HSPA+). I was able to unlock the device and able to install the bootloader 3.34. But root does not work. I think it is because ADB does not recognize the tablet.
What happens:
1.) the start screen of the ToolKit does not show the serial in the adb device list (If I restart the tablet in fastmode it list the serial in fastmode device list)
2.) if I start the Root and the ToolKit wants to reboot in Fastboot Mode it says "Waiting for adb Mode".
3.) If I restart on my own in Fastboot Mode and start the Root procedure then it reboots the device and says "Procedure will continue in 20 seconds Waiting for USB debugging to be enabled". It does not help to re-activate the usb debugging mode and it doesn't help to re-connect the usb cable.
4.) I started cmd and changed to the "Google Nexus 7 ToolKit" folder to call "adb-toolkit devices". But it does not show any device. adb-toolkit kill-server and start-server doesn't help. usb reconnect doesn't help.
P.S. As I'm a new member I'm not able to post inside the official support thread, sorry.

It could be a driver issue on the pc..
try this
download a pc app called usbdview . Do a google search to find it..
Run the program on the pc without the nexus plugged in. Delete all adb/ usb devices that you do not have physically plugged into your computer.
Plug in the nexus 7 refresh the list . Delete what ever comes up for the nexus 7..
Reboot the computer WITH the nexus not connected..
Install the NEXUS DRIVERS.. plug in the nexus and the computer should find the device as if its the first time used.
Try you tool kit again...
Sometimes when adb is started and stopped if there are several versions Windows can be confused and not stop the right driver but start a older version instead VERY Common windows usb issue. This works with any USB Trouble shooting for devices not just Android...
Good LUCK ..

It's pretty obvious that you need to install the correct drivers for the Nexus 7 HSPA+.
I'm not the lowest of the low, but I am the slowest of the slow.

exglynco said:
It's pretty obvious that you need to install the correct drivers for the Nexus 7 HSPA+.
I'm not the lowest of the low, but I am the slowest of the slow.
Click to expand...
Click to collapse
The nexus drives are a One driver for all Nexus Devices... This should only be a issue if there are multiple copies of usb adb in the windows registry . The usb drivers need to be removed then re installed or will just create more conflict. Usb Is NOT SO PLUG AND PLAY as it was intended.. Sometimes just plugging a usb device from one usb port to another in some computers can cause windows to install another copy of the driver. This is mostly on systems with a usb hub then a usb 2.o hub on a different port.. and so on.
I Use my notebook with several android devices . I often have issues with

erica_renee said:
It could be a driver issue on the pc..
Click to expand...
Click to collapse
This could it be. But I found a very simple solution:
stackoverflow.com/a/11991653/318765
When the Nexus 7 is plugged in there is a persistent notification that indicates "CONNECT AS / Media Device (MTP)". In this state adb devices will not show the Nexus, or undoubtedly any other device. Not exactly obvious, but if you select the second option "Camera (PTP)" the device is available for debugging (the lesson is ignore the camera, and focus on the protocol PTP).
This choice is persistent, and I'm guessing that with a band new device it will connect as MTP until told otherwise.
Click to expand...
Click to collapse

[Q] Nexus 7 USB connectivity to Windows XP SP3

Guys, I know i am repeating again the question but despite reading 15-20 posts and uncountable articles, I am still not able to get my nexus 7 working with the Windows XP SP3.
1) To start with, I downloaded the google drivers from ASUS and the MTP Porting Kit from microsoft.When i plug in the device with USB Debugging on, Windows shows 3 new devices- NEXUS 7 & Android ADB Interface.. and ofcourse Windows XP can not find the drivers for any. So i open the device manager and it shows Nexus 7 under unidentified devices. I install the drivers for ADB interface (the ones i downloaded from Asus) and the device becomes ready to use. But there is no option to browse the device from my computer or portable devices. Then i switch the debugging on, and now there is a new device- MTP under unidentified devices. Then i install the MTP Porting Kit, but the MTP device still shows a problem with the driver.
2) The second part of the problem is that all this did not work and even my WMP11 does not recognise the Nexus 7.
The device is just connected and charging!!! What am i doing wrong here???

try this...
http://forum.xda-developers.com/showthread.php?p=34608868
Sent from my Nexus 7 using xda app-developers app

o82239 said:
try this...
http://forum.xda-developers.com/showthread.php?p=34608868
Sent from my Nexus 7 using xda app-developers app
Click to expand...
Click to collapse
It worked, but the MTP keeps popping up for installation again and again.. and I am STILL NOT ABLE TO SEE MY DEVICE

ansh360 said:
Guys, I know i am repeating again the question but despite reading 15-20 posts and uncountable articles, I am still not able to get my nexus 7 working with the Windows XP SP3.
1) To start with, I downloaded the google drivers from ASUS and the MTP Porting Kit from microsoft.When i plug in the device with USB Debugging on, Windows shows 3 new devices- NEXUS 7 & Android ADB Interface.. and ofcourse Windows XP can not find the drivers for any. So i open the device manager and it shows Nexus 7 under unidentified devices. I install the drivers for ADB interface (the ones i downloaded from Asus) and the device becomes ready to use. But there is no option to browse the device from my computer or portable devices. Then i switch the debugging on, and now there is a new device- MTP under unidentified devices. Then i install the MTP Porting Kit, but the MTP device still shows a problem with the driver.
2) The second part of the problem is that all this did not work and even my WMP11 does not recognise the Nexus 7.
The device is just connected and charging!!! What am i doing wrong here???
Click to expand...
Click to collapse
I have exactly the same problem with my windows xp laptop it was OK until I wiped my laptop and reinstalled xp SP1-3 I can't seem to solve it either.
Sent from my Nexus 7 using xda app-developers app

:-/
Is there any justice for me in this bad bad world of octa-core processors and Razer Edge!!! :'(

ansh360 said:
It worked, but the MTP keeps popping up for installation again and again.. and I am STILL NOT ABLE TO SEE MY DEVICE
Click to expand...
Click to collapse
??? It worked and it doesn't work ???
What worked?
Try to delete the precompiled inf-file 'C:\WINDOWS\inf\wpdmtp.pnf', edit the 'C:\WINDOWS\inf\wpdmtp.inf' (see link in the post in the top...), open the XP device-manager, right-click in the yellow '!' and 'update driver'...
twics said:
I have exactly the same problem with my windows xp laptop it was OK until I wiped my laptop and reinstalled xp SP1-3 I can't seem to solve it either.
Click to expand...
Click to collapse
Do you have edit the 'C:\WINDOWS\inf\wpdmtp.inf'?
Sent from my Nexus 7 using xda app-developers app

I had a lot of problems myself getting Windows XP to work with my Nexus 7 as well... eventually I discovered that installing the latest version of Windows Media Player fixed the problem.
I wrote up a post on this issue on another forum (Sorry, XDA - this was before I discovered you guys), back in December of last year.
Anyway, here is my original post...
http://www.nexus7nexus10.com/forum/nexus-7-help/2600-cannot-connect-pc-2.html#post36608
(Actually, this whole thread is worth reading.)
The only nuisance factor is having to remember to re-enable USB debugging (Titanium Backup needs USB debugging enabled, and complains if itsn't) AFTER I've run some MTP Windows XP related file backups (USB debugging needs to be disabled, or MTP won't work)...
....or at least that is my experience.
Hope this is of some use.
Rgrds,
Ged.

Hello guys,
I have the same issue on windows XP with Nexus 7. I tried everything what was suggested and nothing is working.
I have Windows XP SP3 with WMP11 and MTP porting kit installed as well. the device is recognized and driver is instaled fine. But it's not visible on "my computer" in MTP mode. I tried to turn on usb debugging and still device is invisible in windows explorer, the same is when usb debugging is turoned off.
When device is in PTP mode it appears in "my computer" and i'm able to browse it and see all pictures and photos.
How can i browse my device in MTP mode and copy files there? Please reply if anybody knows what to do to fix this issue.
Thank you.

ansh360 said:
Guys, I know i am repeating again the question but despite reading 15-20 posts and uncountable articles, I am still not able to get my nexus 7 working with the Windows XP SP3.
1) To start with, I downloaded the google drivers from ASUS and the MTP Porting Kit from microsoft.When i plug in the device with USB Debugging on, Windows shows 3 new devices- NEXUS 7 & Android ADB Interface.. and ofcourse Windows XP can not find the drivers for any. So i open the device manager and it shows Nexus 7 under unidentified devices. I install the drivers for ADB interface (the ones i downloaded from Asus) and the device becomes ready to use. But there is no option to browse the device from my computer or portable devices. Then i switch the debugging on, and now there is a new device- MTP under unidentified devices. Then i install the MTP Porting Kit, but the MTP device still shows a problem with the driver.
2) The second part of the problem is that all this did not work and even my WMP11 does not recognise the Nexus 7.
The device is just connected and charging!!! What am i doing wrong here???
Click to expand...
Click to collapse
Recently got a 2012 Nexus 7 from a retailer selling this model with updated Android at very attractive price, and initially able to connect to computer so promptly rooted the device with the Nexus Root Toolkit from Wugfresh Development (in this forum), afterwards had same problems with not being able to read / transfer files.
Tried every fix I could find in other threads, and although device manager saying that connected as 'ADB Device' with debugging on, or 'Google Nexus 7 ADB Device' with MTP on and debugging off, still stuck with no access.
Looking closer at the MTP configuration ('Google Nexus 7 ADB Device') under device manager noticed that details listed manufacturer as 'ClockWorkMod' , and eventually that this originated within a Windows\Inf file titled 'oem60'.
I cut and pasted the 'oem60' file to another directory (to keep it safe just in case this upset something else) then on reconnecting the Nexus 7 as MPT with debugging off, device manager found and installed the correct driver at last. Now able to see and transfer files to / from it.
Presumably could alter the relevant lines in the 'oem60' file, which aren't hard to find, and put it back to original directory, but my other devices also working fine so not done so as yet.

Taowtp said:
Recently got a 2012 Nexus 7 from a retailer selling this model with updated Android at very attractive price, and initially able to connect to computer so promptly rooted the device with the Nexus Root Toolkit from Wugfresh Development (in this forum), afterwards had same problems with not being able to read / transfer files.
Tried every fix I could find in other threads, and although device manager saying that connected as 'ADB Device' with debugging on, or 'Google Nexus 7 ADB Device' with MTP on and debugging off, still stuck with no access.
Looking closer at the MTP configuration ('Google Nexus 7 ADB Device') under device manager noticed that details listed manufacturer as 'ClockWorkMod' , and eventually that this originated within a Windows\Inf file titled 'oem60'.
I cut and pasted the 'oem60' file to another directory (to keep it safe just in case this upset something else) then on reconnecting the Nexus 7 as MPT with debugging off, device manager found and installed the correct driver at last. Now able to see and transfer files to / from it.
Presumably could alter the relevant lines in the 'oem60' file, which aren't hard to find, and put it back to original directory, but my other devices also working fine so not done so as yet.
Click to expand...
Click to collapse
The above workaround was spot on, thanks

How to get USB Debugging mod to work?

I have a nexus 7 2012 and i am trying to install 4.3. Of course since i have rooted it and have twrp on it i cant just ota update, so i tried plugging it up to my computer. Right now everytime i plug in the device and use it as a media device it works until i turn on developer mode and enable usb debugging. As soon as i turn on debugging the device disconnects at the bottom right showing my N7 (on windows 7), and whenever i look in my computer its not there also. The only way i can find it in this mode is in device manager in which it says "android phone". I figured maybe i have a driver problem, but if you look for drivers and try to install it says it already has them.
So does anybody know how to get it to work so i can reset it?

Delete the current drivers than manually choose the n7 drivers you downloaded from xda.
Or use a free program called usbdeview for windows to seek out all drivers associated with a device to make sure you uninstalled them correctly. Also I highly recommend dual booting a Linux distro which is much less finicky than windows when using android
Best of puck
Sent from my Nexus 7 using Tapatalk 2

demkantor said:
Delete the current drivers than manually choose the n7 drivers you downloaded from xda.
Or use a free program called usbdeview for windows to seek out all drivers associated with a device to make sure you uninstalled them correctly. Also I highly recommend dual booting a Linux distro which is much less finicky than windows when using android
Best of puck
Sent from my Nexus 7 using Tapatalk 2[/Q
Can you inform me on how to delete the current drivers?
when i connect with usb debugging mode turned on it connects as nexus 7 with a description as Android Composite ADB Interface. Also it is not recognized under the my computer setting at all. In usb deview it also has a purple dot all the way to the left beside the name instead of a green dot.
When i connect to the pc without usb debugging on the computer recognizes it as nexus 7 \ media device and i can use it as storage back and forth and in usb deview it has a green dot beside the name
Click to expand...
Click to collapse

[Nexus 7 - 2012] Windows 8.1 wont recognize my tablet

Hi everybody.
I have a problem with my Nexus7 tablet, windows 8 can't see it on Devices and drivers and after I plug off the usb cable this error message appears:
Image like: The last USB device you connected to this computer malfunctioned, and Window does not recognize it.
First thing I opened the developer options and checked USB Debugging, after that a strange icon with 4 vertical white rows appears on the notification tab, It was not the usually USB debugging icon.
Then I went on Device Manager and under Acer Devices (Why Acer ???) I found ACER Composite ADB Interface, so I've decided to install again the drivers following this guide:
-----------------
But at the point 8 I can't see "USB composite device" but only "Acer composite ADB interface".
Since yesterday the tablet worked, and I have not update the tablet neither the pc.
What should I do ?
Thanks for the help, sorry for my bad english
* I have few message so I can't upload images or link, sorry for the inconvenience.

I opened now "Devices and Printers" and I saw Nexus7 (with the correct label) under "unspecified", I cannot interact with it

mmm no one ?

I have the same issue with my 8.1 laptop. I think the Acer driver is something which Microsoft pushed in an update to 8.1 recently. I may go in and see if I can revert it. Not sure I am much help as my only workaround was to grab my Win 7 laptop, which worked as it should. I did not have the time or patience to screw with it.

Pickeroll said:
Hi everybody.
I have a problem with my Nexus7 tablet, windows 8 can't see it on Devices and drivers and after I plug off the usb cable this error message appears:
Image like: The last USB device you connected to this computer malfunctioned, and Window does not recognize it.
First thing I opened the developer options and checked USB Debugging, after that a strange icon with 4 vertical white rows appears on the notification tab, It was not the usually USB debugging icon.
Then I went on Device Manager and under Acer Devices (Why Acer ???) I found ACER Composite ADB Interface, so I've decided to install again the drivers following this guide:
-----------------
But at the point 8 I can't see "USB composite device" but only "Acer composite ADB interface".
Since yesterday the tablet worked, and I have not update the tablet neither the pc.
What should I do ?
Thanks for the help, sorry for my bad english
* I have few message so I can't upload images or link, sorry for the inconvenience.
Click to expand...
Click to collapse
You may wish to go to Storage, on the Nexus 2012, and under the 3 dots, USB computer connection menu, and tick/untick Media Device
Windows 7 and 8, appear to have USB storage driver conflicts, when many different devices have been used repeatedly.
Good Luck!
There are other posts, in the General section, that deal, with this annoying issue.

ROLY5573 said:
You may wish to go to Storage, on the Nexus 2012, and under the 3 dots, USB computer connection menu, and tick/untick Media Device
Windows 7 and 8, appear to have USB storage driver conflicts, when many different devices have been used repeatedly.
Good Luck!
There are other posts, in the General section, that deal, with this annoying issue.
Click to expand...
Click to collapse
Thanks for the hep but it didn't work.
Now the "old" icon came back with "connected as a media device" written with it but the tablet remain invisible.

Same problem here.
Fixed it by disconnecting teh device, going to device manager, showing hidden devices and uninstalling everything related to Nexus 7.
This includes Acer ADB, Android, Nexus7 and unknown devices.
After that I downloaded the Android SDK and installed the Google USB driver from it, connected my Nexus 7 and it werks.

pepo930 said:
Same problem here.
Fixed it by disconnecting teh device, going to device manager, showing hidden devices and uninstalling everything related to Nexus 7.
This includes Acer ADB, Android, Nexus7 and unknown devices.
After that I downloaded the Android SDK and installed the Google USB driver from it, connected my Nexus 7 and it werks.
Click to expand...
Click to collapse
Still nothing, I showed the hidden devices and unistalled all the voices under the "Acer" directory, I haven't found anything related to Android/Nexus 7.
Then i went to http://developer.android.com/sdk/win-usb.html and downloaded the USB driver, but the Nexus7 result again as an unspecified hardware.

Now it works ! I didn't touched it in the last 2 hours and now it works. :good::good: