yashsingh1/xdaforums huggingface dataset:
[Nexus 7 Q&A, Help & Troubleshooting] Tedly1:
Nexus 7

Hi, I've also just had this happen to me and after trying all of the above without success I finally tried the roll back to old driver option and all is back to normal plus working again. Hope this helps.
[Nexus 7 Q&A, Help & Troubleshooting] bspanic:
Hi btw what ended up to be mine problem is that i use mine tablet for car stereo and every time i turn on car mine alternator spiked to big electricity and fried usb port it wasnt driver releted problem, i went to car mechanic and realized that alternator is faulty.
[Nexus 7 Q&A, Help & Troubleshooting] ryanm508:
This worked for me

Been having the same problem since flashing the L preview. Had no problems before that, read this thread and tried just about everything, nothing worked. Running windows 8 and the only change was I installed Minimal ADB and Fastboot so I could flash the L preview. Device manager was recognizing it with USB Debugging on and off but windows explorer wasn't. I'm pretty sure that Minimal ADB updated the drivers and that was the problem. I uninstalled the drivers, but it automatically re-installed the same one, did this both with USB Debugging on and off. Then I tried "roll back driver," and it is working fine now. Had to do it twice, with USB debugging on and then off to get it to recognize it in both modes. With USB debugging off I went from a Google driver version 7.??? to a Microsoft one, version 6.3.9600.16384. I don't remember the version with debugging on but it was a Google one, the one that is working now is Google version 9.0.0.0. Hope this helps
[Nexus 7 Q&A, Help & Troubleshooting] wolf77ar:
MTP Problem

After several days of nerves, I solved the problem this way.

On Device Manager, I uninstalled the drivers for Android ADB Device, I ran the scan for new hardware detected and when the Update Window came I unchecked

Obtaining Online Software

and drivers for my Nexus7 were installed locally.

I had installed before AsusInstaller.exe

Now my tablet correctly appears on Device Manager / Portable Devices / Nexus7 and internal storage can be accessed from Windows Explorer ;)
[Nexus 7 Q&A, Help & Troubleshooting] omama:
nngicuwhich

Hi guys,

Found the solution to this issue.

basically connect your nexus 7 as normal MTP mode. once its detected go to device manager. find acer devices. right click>properties>drivers>roll back driver.

this will detect you nexus 7 instantly.

Hope this works.

Thanks.
[Nexus 7 Q&A, Help & Troubleshooting] Jthefirst:
Guys.. I spent 3 hours starting from page one - tried half a dozen things and the problem persisted... When I finally said "ok - page 30.. last try...", the above proposed solution worked!!!
[Nexus 7 Q&A, Help & Troubleshooting] Atap2345:
This Could help......

Go to settings>Storage and the click on the menu icon (top right corner)>>click on USB connections>then select MTP and it will work perfectly fine!

Hope this helps u guys!
[Nexus 7 Q&A, Help & Troubleshooting] fingwe_1:
Found real solution

after reading all the posts and thinking a lot about what people here said. I have finaly found a working solution for me that I think will work for everybody.

explanations:

A lot of you guys said that this problem started after using a car charger for the nexus 7. Then I recalled that when I bought my nexus 7 it was sometimes charging very slowly on the original charger. I then read on some forum that the nexus 7 had two state of charging to be nice to the battery.

That is when I thought, if there is two state of charging, then the nexus 7 must reset the usb port in order to change mode. So I did the test. I plugged my nexus 7 to the original asus charger that came with it and unplugged it a couple a times. ( maybe 4 or 5 times ) then I plugged it into my computer and VOILA!

It works!!!

this is not a permanent solution because when the nexus tries to enter another state of charge while not connected to the original charger I think that the usb port hang somehow...
[Nexus 7 Q&A, Help & Troubleshooting] johnomanolo:
As shocked as I am after doing the above to my nexus 7 it started to work as it should.

I've been developing on android using multiple devices and had no issues with N7. However, a while ago it started to disconnect and reconnect repeatedly until the cable was unplugged. Tried 3 different cables, two different USB 3.0 ports and one 2.0 port (also connecting through a hub). Only the N7 had problems while N5 worked fine and old GT-I9000 (galaxy s1) also had no issues. The only thing I haven't checked is connecting to a different PC, but since other devices are fine I assume the cables, ports and drivers are fine too.

This is a N7 issue but it miraculously got solved by plugging and unplugging to a charger a few times (it was N5 charger actually, I lost the other one...)

UPDATE:

well, a few days later and the problem is back, doing the plugging and unplugging does not seem to work, no idea what is wrong... looks like the usb port on the N7 is broken. sometimes works and sometimes doesn't... weird stuff.
[Nexus 7 Q&A, Help & Troubleshooting] makalele2:
I didn't believe this, because I already tried EVERYTHING. That sounded crazy.. but.. it worked... After doing this my mac immediately connected with nexus 7. Cheers!!

Btw. is there any tool (for root?) to prevent this from happening?
[Nexus 7 Q&A, Help & Troubleshooting] rgp95:
Same issue, after put my nexus on chinese car charger :crying:
[Nexus 7 Q&A, Help & Troubleshooting] ValleychickCa:
Nexus vs PC

Plug your Nexus in to your PC or Laptop whichever you are using, go to this pc,you'll see the Nexus icon right click on Nexus and transfer pictures and videos. :)
[Nexus 7 Q&A, Help & Troubleshooting] rgp95:
Not working. Works otg, charger. But no working as USB device, fastboot, dev

Enviado de meu Nexus 7 usando Tapatalk
[Nexus 7 Q&A, Help & Troubleshooting] clipdelta:
Alternative Solution:

I'm using an N7, 2nd gen. unrooted but unlocked boot loader. Based on experience upon using nexus 7 for almost 2 years now, N7 has a problem when transferring .mkv, .mp4, or other media files. There are times when my n7 will be detected just fine and sometimes it wont. First i try switching cables. I always have a fresh N7 cable at spare. Next i turn on and off the usb debugging. Sometimes N7 will get detected even when usb debugging is off. When N7 gets detected, I sometimes encounter the notification that the "device has stopped working" in midst of transferring media files. In that event, i reconnect the usb cable, and then change the extension name of the media file. Example: video.mp4 ----> video.mp4aaa. The media file then gets copied. When copying multiple large media files, sometimes i encounter the same error. When that happens, resorting to copying the files one by one works. Once all the copying is done, change back yung media files' extension name back to its original format, both for your nexus and the files on your pc. Example: video.mp4aaa ------> video.mp4.

Hope this helps.
[Nexus 7 Q&A, Help & Troubleshooting] rgp95:
I check logs, usb no change detected. Likes usb never connected.

I buy a new usb cable too. I try something hard, buy new usb connector with audio plug, but not work.

I have otg, charging worksfine, but pc never recognised my nexus 7 after chinese car charger.

My luck is i have unlocked and root my device before, soo i use Folderfile sync to put new files, and i use external usb with OTG cable to change room, backup.

I think is a ****ing bug or damaged board.
[Nexus 7 Q&A, Help & Troubleshooting] bennor3814:
Joining the club with people with USB port problems. For the last year my N7 2012 will charge via USB cable but any time its connected to a PC, no matter what USB cable I use, it throws the unrecognized device message in Windows. Using an OTG cable to connect external devices like flash drives works erratically nor not at all now too.

Anyone had any luck fixing these kinds of issues short of replacing the entire motherboard/USB port?

Any way to downgrade firmware or unlock/root without USB port/cable access?
[Nexus 7 Q&A, Help & Troubleshooting] ktdassoff:
Bad Data Contacts?

I've also used the Amazon-branded car charger, but only (as far as I can recall) with a different device which does not have this problem like my Nexus 7. I don't think that's the issue.

On one or two rare occasions, I could get my Linux PC to acknowledge the device, but not consistently. My best guess is that there's either something wrong with the data contacts in the Nexus' USB port, or, more likely in my opinion, there's a bug in the Nexus 7's kernel regarding how it responds to the USB signals coming from the computer. Both my Windows and Linux computers (different computers entirely) report that they can't communicate properly with the unknown USB device (i.e. my Nexus 7) to figure out what USB protocols are supported. On Windows, it says "Device Descriptor Request Failed", on Linux, the kernel says "unable to enumerate USB device" and "device descriptor read/64, error -62".

Update:

I've tried some other posts on here, namely the one about plugging and unplugging from the included charger a few times. Nothing has worked consistently. I've once again gotten the USB connection to register, but only after plugging and unplugging from my computer several times. As far as I can tell it's a kernel or hardware bug on the Nexus end, and whether it works is random luck. I'll update if I find something new.
[Nexus 7 Q&A, Help & Troubleshooting] Ganondroid:
I was having these same issues. I tried everything I could think of on the device, and I finally fixed the problem. For me it was a driver issue in windows. Here are the steps that fixed it for me.

Plug N7 into USB port on PC

Set USB type on device to MTP/FileTransfer (if this step is done out of order, Windows will install the update for charging mode, and it won't work correctly. I believe this is what was causing my issues at least.)

Open device manager on PC

Under "Android Device" tree, it should list Nexus 7 ADB or something to that effect. Right click on that and choose uninstall

Be sure to check the box asking to delete the driver files

Allow windows update to reinstall the device, and it should start working correctly
[Nexus 7 Q&A, Help & Troubleshooting] mtendler000:
Fixed mine by turning Developer options off then back on and then ADB debugging back on. My Nexus 7 2013 randomly stopped being recognized by my two PCs while it was actually connected to one. Hope my stroke of luck can help a fellow Nexus 7 owner.
[Nexus 7 Q&A, Help & Troubleshooting] Udavf:
Also try to wipe DATA partition, worked for me
[Nexus 7 Q&A, Help & Troubleshooting] Lengineer:
Interesting Discovery

I like many of you posting to this thread have felt the pain of having my own Nexus 7 2012 fail to connect to a PC no matter what setting and drivers you install. I decided to breath some new life into my Nexus 7 2012 by buying a new motherboard. I wanted to used it as a Headunit for android auto. Before when I had the old motherboard (The one that would not longer connect to the PC) The battery would die almost within a few hours while being completely off. For those who think that is a battery issue this is not the case. Since I had it all apart I thought being an engineer I would take a couple measurements. I have found by comparison between the new and the old board. There is a higher resistance between the battery and come of the main board components, which would be a result from a burned out IC (Location to be Determined) Once I have pin pointed which component went bad it might be possible to replace. This is at least Identifying why it happens. I will report on my findings.
[Nexus 7 Q&A, Help & Troubleshooting] Coldblackice:
Any update on this? Did you ever find anything else out?
[Nexus 7 Q&A, Help & Troubleshooting] bspanic:
If its not driver (if they r u r lucky) then its usb ribon (usb port) that needs to be replaced.
[Nexus 7 Q&A, Help & Troubleshooting] aiamuzz:
hmmmm ... same here ... if lucky the adb and mtp thing shows up on the notification bar ... else its only charging that works ... file transfer and adb mostly is lost.
[Nexus 7 Q&A, Help & Troubleshooting] gierso:
ihave this problem ( is not driver related as there is no device onwindows to update the driver for)

i think some how it got burnt somewhere... but weird thing is that When connecting an usb drive thru and OTG cable it read from the drive..

but there is no response from pc...

as [MENTION=7512988]Lengineer[/MENTION] mentions maybe the board fried so whatever...

im glad i already had TWRP recovery installed so i have to use the USB OTG road to load stuff to the tablet now ...
[Nexus 7 Q&A, Help & Troubleshooting] digipix:
Same problem as most of you

I changed the ribbon cable and USB board and still the same result (although I also didn't have gyro working and ribbon cable fixed it)

I even dual booted W7 on PC to discard drivers incompatibility.

Still no signal on pc. Only charging.

Choosing MTP/PTP on developer settings does nothing as it changes back to charging as soon as I get out of the selection popup.

Going to Storage & USB and checking the vertical ... only says "Help & feedback"

My 2 remaining ideas are :

- new MB

- try usb2 instead of usb3
[Nexus 7 Q&A, Help & Troubleshooting] kingabo:
Thanks, this solved my problem!

Edit: no, it didn't. Original cable + charger charges another nexus 7 but not mine when it's already turned on. If I turn it off, plug it to the charger then it starts to charge and I can turn it on and it keeps charging. BUT when I plug it to the charger when it's already on then it won't charge...
[Nexus 7 Q&A, Help & Troubleshooting] Swedish78:
The only thing that worked for me was too factory reset the nexus 2013 device but have it connected to the PC with a USB cabel true the reset process, PC installed all nexus drivers and the device was able to be seen as a flash disc.

It worked for me.
[Nexus 7 Q&A, Help & Troubleshooting] TopNotch729:
You might've just been able to uninstall and reinstall the driver in the device manager... But I guess that's a roundabout way that works.
[Nexus 7 Q&A, Help & Troubleshooting] kevchaps:
Has the op, or anyone, had any luck?
[Nexus 7 Q&A, Help & Troubleshooting] Anubis14:
Same boat here. C60 series. plugged it into a different pc to charge overnight....not able to see it from my laptop or any other pc since. charges fine by usb or wall plug. tried: reset, driver removal/reinstall...nothing.
[Nexus 7 Q&A, Help & Troubleshooting] tubbocks:
Me too. Is it weird that there seems to be a spate of this happening in a relatively short space of time? I'm on AOKP btw. Reflashing, system resets etc no joy.

I have tried connecting on 3 different PCs (all of which are Win 7 x64) with 4 different cables. My Sensation shows up fine, don't have any other MTP devices to try.

I too have recently used a charger from Amazon.

TRIXES Black Micro 2 Port USB Car Charger Adapter for iPod iPhone iPad Mobile SatNav Splitter

Coincidence?
[Nexus 7 Q&A, Help & Troubleshooting] kevchaps:
So, I guess I will be rma this tablet within the not so distant future. As the saying goes, buyer beware. What I don't understand, why Asus doesn't make a car charger for their tablets? Unless I'm missing something, cause I've been looking for nearly a year, with my tf101, and my n7,without ever seeing an Asus branded car charger.
[Nexus 7 Q&A, Help & Troubleshooting] tubbocks:
sad thing is I only just got mine back after getting a line of dead pixels on the screen - Asus have had my N7 as long as I have :-/
[Nexus 7 Q&A, Help & Troubleshooting] TECK:
I'm in the same boat. My tablet is perfect, the screen is very accurate related to colors. After going through 2 tables, I really don't want to refund this one... At least for me the PTP works rightaway. When I switch to MTP, things are broken, I cannot access the SD card. I do have the officialy Google drivers installed and my Nexus phone works perfect when connected to PC.

I read in this thread that someone used WMP13, where did you get it? I don't see it realeasd, I run Windows 7 Ultimate.
[Nexus 7 Q&A, Help & Troubleshooting] idivorceyou:
I stumbled on a solution

I did all the driver installs - several times.

The tablet definitely is seen by the computer in ADB mode.

Nexus 7 rootkit works on it.

but Windows XP did not see it as a USB device.

I turned off USB debugging on the Nexus 7 while in MTP mode. bingo, it immediately showed the device.

Your mileage may vary
[Nexus 7 Q&A, Help & Troubleshooting] Kaeri:
Thanks!

Worked perfectly, thanks!:D
[Nexus 7 Q&A, Help & Troubleshooting] rlanza1054:
Windows XP does not support MTP.

You need to install the MTP XP addon.

Rob
[Nexus 7 Q&A, Help & Troubleshooting] TECK:
Anyone knows if 4.1.2 fixed anything related to the MTP issue? I noticed an optional Windows Update for Samsung MTP devices. I installed this and my tablet does not gets recognized.
[Nexus 7 Q&A, Help & Troubleshooting] Anubis14:
Upgrade to 4.1.2 didn't fix it for me.
[Nexus 7 Q&A, Help & Troubleshooting] sparx:
Tried this method, finally got pc to see the device :)

It's a tad annoying to keep switching between usb debugging on and off, but at least it's working....

Thanks:highfive:
[Nexus 7 Q&A, Help & Troubleshooting] moofdoof:
I've got this problem after attempting to update to 4.1.2

Was working fine before. Now it won't show up at all.

Uninstalled all drivers, but when I plug it in it doesn't even get noticed in device manager on windows or the device.

Strangely USB OTG works. But connecting to a computer does nothing.

Tried flashing rom, kernel, bootloader. Still nothing.

When I plug it into the wall, still says battery is discharging. But it seems to charge.

It charges with power off.

Been trying to fix this all day, no progress.

Sounds like the problem in this thread. Any suggestions? :(
[Nexus 7 Q&A, Help & Troubleshooting] RenAndStimpy:
Looks like a windows problem. At home the MTP connection works on both Win7 64 bit and Linux (using jmtpfs) but at another computer, also Win7 64 bit, there is no device showing.
[Nexus 7 Q&A, Help & Troubleshooting] moofdoof:
Hmm interesting. Maybe the update messed it up. Because it *was* working on my win 7 64 before.

only tried it briefly on another computer and didn't work.

I'll try playing with drivers again (but I have a bunch of times already)
[Nexus 7 Q&A, Help & Troubleshooting] robbtheskater:
Solution has finally arrived!

SOLUTION/WORKAROUD TO USB TRANSFER ISSUES

Download AirDroid and watch the video/read the instructions to use it.

I moved 22gb of music to my 32gb Nexus 7 that refused to connect via USB no matter what I did. And I've done pretty much everything on the internet.

If you need to move files, then this is your solution. If you ABSOLUTELY must have a USB cable connected, then this will not work for you.

YOUR WELCOME!

P.S. I can't post the link because my account is on Noob status so just google "AirDroid"
[Nexus 7 Q&A, Help & Troubleshooting] tuxin2007:
Same error here after charging it on a car charger during the weekend.

I've checked all solutions, without success.

Airdroid is a temporary solution, I'll probably send back my device to my buyer during the week if no other solution can be found

---------- Post added at 12:42 PM ---------- Previous post was at 12:28 PM ----------

There are some logs found in console.app on Mac 10.7 in case it could help to understand better this issue:

11/12/12 12:40:38.192 PM hidd[62]: MultitouchHID: device bootloaded
11/12/12 12:40:38.000 PM kernel[0]: AppleUSBMultitouchDriver::message - kIOUSBMessagePortHasBeenReset.
11/12/12 12:40:38.000 PM kernel[0]: AppleUSBMultitouchDriver::checkStatus - received Status Packet, Payload 2: device was reinitialized

Please tell me if you need more information.

---------- Post added at 14:03 PM ---------- Previous post was at 12:42 PM ----------

Other logs, I've tried again a got other logs in console.app :

11/12/12 2:02:58.000 PM kernel[0]: AppleUSBMultitouchDriver::_deviceGetReport - DeviceRequest for reportID 0x0 returned with result 0xe000404f - retrying
11/12/12 2:03:02.375 PM mdworker[17865]: Unable to talk to lsboxd
11/12/12 2:03:02.000 PM kernel[0]: AppleUSBMultitouchDriver::_deviceGetReport - DeviceRequest for reportID 0x0 returned with result 0xe000404f - retrying
11/12/12 2:03:02.000 PM kernel[0]: Sandbox: sandboxd(17866) deny mach-lookup com.apple.coresymbolicationd
11/12/12 2:03:04.276 PM sandboxd[17866]: ([17865]) mdworker(17865) deny mach-lookup com.apple.ls.boxd
11/12/12 2:03:06.000 PM kernel[0]: AppleUSBMultitouchDriver::_deviceGetReport - DeviceRequest for reportID 0x0 returned with result 0xe000404f - retrying
11/12/12 2:03:10.000 PM kernel[0]: AppleUSBMultitouchDriver::_deviceGetReport - DeviceRequest for reportID 0x0 returned with result 0xe000404f - retrying

So the usb communication (I really don't know how it works) is happening, but probably send useless information to the computer.
[Nexus 7 Q&A, Help & Troubleshooting] tuxin2007:
Well, the most annoying thing about this issue is that we're now unable to fastboot a new bootloader image (and, for example, return to stock for upgrade to 4.2).

Would someone have an idea about how to debug this issue?

I'm supposing it comes from a protection switch on low-level, but I still can't figure out how to find this information.
[Nexus 7 Q&A, Help & Troubleshooting] tuxin2007:
I've exchange my nexus 7 at the shop today, so I wont be able to help anymore in this thread, good luck, I sincerely hope a solution can be find.
[Nexus 7 Q&A, Help & Troubleshooting] robbtheskater:
OFFICIALLY SOLVED!.... for me anyway

Media Feature Pack for Windows 7 N with Service Pack 1 and Windows 7 KN with Service Pack 1 (KB968211)

Google search that and download it from Microsoft's website.

Right after I installed that and any subsequent updates it asked me to install, it worked. I restarted my computer when it was done like it asked and then rebooted, I connected the device in DEBUG MODE and now it WORKS!!!!!

If you have Windows 7 64 bit or Windows 7 N 64-bit please try this. If that doesn't work by itself then uninstall Windows Media Player and download the latest version for your pc. Make sure you choose the right bit (32 or 64) that your pc is installed with.

After trying every driver on the internet, this fixed it.
[Nexus 7 Q&A, Help & Troubleshooting] kevchaps:
What about if you're running 64 bit vista? Any thoughts on that?
[Nexus 7 Q&A, Help & Troubleshooting] BillGoss:
Fyi, there's a flashable zip version of the bootloader available here: http://xdaforums.com/showthread.php?p=34055981

So now you can update the bootloader even without fastboot.

Sent from my Nexus 7
[Nexus 7 Q&A, Help & Troubleshooting] moonroy:
Same problem here. It used to work, not sure when or why it stopped. I have connected the Nexus 7 several times before, with drivers and everything working just fine.

Then I unlocked the boot loader and rooted it. After the OTA a month ago maybe I lost root. Didn't mind, but a couple of weeks ago I wanted to restore root. Could not for the world get either of my machines to recognize it. Tried different cables, which all works with my Htc Sensation just fine.

Waited for the 4.2 and installed it OTA as well. Still no go. Have entered the developer settings (why was it hidden in 4.2?) and enabled usb debugging and disabled it in combination with the storage/usb connection settings. Can't get it to work.

It charges just fine connected to computer so the micro usb port can't be totally broken, but I suspect a hardware fault somehow. Can't see any problems visually compared to several other items, but why will it not work if not broken somehow?
[Nexus 7 Q&A, Help & Troubleshooting] ezieger:
I had trouble mounting the n7 in (XP) explorer until I turned off USB debugging.
[Nexus 7 Q&A, Help & Troubleshooting] Engstrom:
I'm having the same problem as danox82. Has anybody found a solution?

I've contacted Google Play but they are absolutely useless. Asus recommends a RMA but talking to Google Play is like talking to a wall. :(
[Nexus 7 Q&A, Help & Troubleshooting] kevchaps:
RMA for mine, good luck