Database Info

USB unknown device

I've tried the drivers from Samsung, Keis, ODIN one click. None of them worked on 4 different machines, Windows 7 both x64 and x86(which was a fresh install), and two Windows XP machines. I tried it on Ubuntu(10.04 LTS) and that recognized the captivate.
Anyone know how to get one of those to correctly recognize my Captivate so I don't stuck on Samsung's/AT&T's 2.2

uninstall all of the driver that you downloaded. uninstall kies. then go to samsung.com search for the captivate, choose you phone, click the 'i own this' button. then go to get downloads, software. click on the .zip file icon next to usb drivers. if that didnt work uninstall them then download kies again. if it still doesn't install them, open kies, click menu, reinstall drivers

What is it that you're trying to do?
Sent from my SAMSUNG-SGH-I897 using XDA App

If it is coming up unknown device try another port. You may want to try another microusb cable as well.
Sent from my SAMSUNG-SGH-I897 using XDA Premium App

I've always had luck with the drivers in the captivate aio toolbox. Even on a fresh win7 64bit when I replaced my boot drive with a ssd a month ago.

Samsung really failed at the USB drivers for the Captivate. I would expect to be able to install the drivers from their website. Plug in my phone, and have it working.
trell959 said:
uninstall all of the driver that you downloaded. uninstall kies. then go to samsung.com search for the captivate, choose you phone, click the 'i own this' button. then go to get downloads, software. click on the .zip file icon next to usb drivers. if that didnt work uninstall them then download kies again. if it still doesn't install them, open kies, click menu, reinstall drivers
Click to expand...
Click to collapse
I tried that before, didn't work.
bornjamerican said:
What is it that you're trying to do?
Click to expand...
Click to collapse
I'm trying to:
1) connect as a mass storage devices. Yes I know turn on USB debugging and to mount the drive.
2) flash back to stock 2.1 or root my phone so I can install a custom ROM on it. Might go with CM7/MiUi or something from Team Phoenix. So use Odin3
shinji257 said:
If it is coming up unknown device try another port. You may want to try another microusb cable as well.
Click to expand...
Click to collapse
Tried all of the ports on the computers. I don't have another microusb cable to test to see if that's the problem, but I'll check that tomorrow.
Johnnie5000 said:
I've always had luck with the drivers in the captivate aio toolbox. Even on a fresh win7 64bit when I replaced my boot drive with a ssd a month ago.
Click to expand...
Click to collapse
I'm going to try a fresh install of windows 7 32-bit with aio toolbox see if that works.
Tried my friends brand new microUSB cable. It worked.

I have tried 4 known good cables know, 4 different computers and every USB port available on all 4 of the PCs I tried. Only once did it identify the device and install the drivers and I was able to root it but I still can't sideload because after the reboot after rooting it is back to device not recognized/unknown device. This has been a total pain. Any suggestions? I'm not with AT&T any more so I am out of luck for just bringing it into a store and asking them to take care of it.
Edit: Sorry for bumping an older post but I did it instead of starting a new thread.

rmriggin said:
I have tried 4 known good cables know, 4 different computers and every USB port available on all 4 of the PCs I tried. Only once did it identify the device and install the drivers and I was able to root it but I still can't sideload because after the reboot after rooting it is back to device not recognized/unknown device. This has been a total pain. Any suggestions? I'm not with AT&T any more so I am out of luck for just bringing it into a store and asking them to take care of it.
Edit: Sorry for bumping an older post but I did it instead of starting a new thread.
Click to expand...
Click to collapse
If you're just trying to transfer apk files to it for sideloading, you can use a wifi transfer app. I use Wifi File Explorer and it's great. You can connect to your phone via web browser and upload/download anything on the SD card.
Another option is to use an external SD card that you can remove and plug into your computer, transfer the files to it, then insert it back into the phone.
This won't work for connecting to PC apps like Odin, Heimdall, or Kies, but for simple file transfers it works like a charm.
Additionally, regarding other usb cables, you didn't mention what types of cables you used, so I'll throw in another thought. The cables that come with the Captivate don't work on some PCs (like my new iMac). Third-party, generic usb cables might not work, either (I tried some and got a whole lot of fail). The only cable that works for me is the one that came with my wife's Motorola phone. If you haven't tried one yet, I would recommend getting your hands on a Motorola cable and testing it out. You'll immediately notice the cable is much thicker. I don't know if that has anything to do with why it works when others don't, but there's something about that cable that others don't have.

Bad Phone?
Could it be the phone port is having issues?
I've had the same problem and it seems that the port on the Captivate is shot which may be your issue. it will always charge; but tends to cause a lot of profanity when trying to get a PC connection to transfer files or flash it. It will be seen, then immediately play the 'unplugged' sound from windows. I've sat there and had it play the tones of plugged in and un plugged over and over again just by tilting the phone from side to side. No matter what cables I use (tried several but they are all samsung due to the recessed port). If it establishes the connection; I have to be very still with it or it'll lose it. If it loses it; I get unknown device messages or not functioning messages on that port until I reboot the PC.
Trying to flash anything via ODIN takes a lot of patience.
Those same cables / USB ports are used on my wife's Focus without ever having a problem. I wrote it off as too much flashing / overclocking of my phone but am not sure.

hi i was having this issue as well. i solved it by:
1. download a good & stable miui rom, rename it to update.zip and place it into your sd card. i took the sd card out of the phone and used a adapter to connect the sd card to my PC since i can't access my sd card through the usb port.
2. put the sd card back into my phone, turn off my phone. press and hold volume up and down buttons, then press n hold the power button till the screen shows something.
3. select install from sd. wait until the installation finishes and select reboot the phone.
4. when you're in your new miui rom, try to connect your phone to the pc via usb port again.
this worked like charm for me.
about the miui rom, i suggest you to use the one from miuiandroid.com (the UK version)
after flashing the rom im able to connect via usb and use mass storage.
hope this helps

Also, when you uninstall drivers, don't forget to look in the program files for anything that may have been left behind and delete it.

From the description it sounds strongly like you are actually experiencing a port failure which is common on the Galaxy S devices. PM me if you need this repaired...

Only try another usb cable, i bricked my cappy with a bad contact cable on odin, unknown device too, new cable=i897 device on windows notifications
try and feedback!

strange, this only happened to my when i soft bricked my phone. try connecting it to your computer in download mode

I had this issue once before. Here is what I did which resolved the problem. I was using a windows 7 PC
1. Download the ADB kit and extract it to C drive.
2. Connect your mobile to the PC on USB port
3. Wait for the drivers to be installed automatically (it might give you a failed to install message)
4. Never mind that message. Open Device Manager
5. In Device Manager, if you expand the "Universal Serial Bus Controllers", you'll see a device that has yellow question mark against it. This is your phone and since drivers are not installed properly, it has the question mark.
6. Right click that device, and select "Update Driver".
7. IN the window that comes up, select "I'll select a driver".
8. Browse to the folder where you have extracted the ADB kit on C drive
9. Check include subfolders and click Next.
10. The drivers should be be installed and your device should be identified by the computer.
Let me know if it works for you.

Can't get internal SD to mount on computer

When I plug my phone in I have no way to transfer files to and from the Nexus 5. Nothing comes up. Tried updating the drivers, but nothing works. Please help.

I haven't been able to do this either, anyone wanna help?

connect phone to pc via usb
go to Device Manager
right click anything that looks like the phone and uninstall drivers
unplug phone
restart pc
connect phone to pc via usb
let it install drivers automatically
fixed?
Sent from my Nexus 5 using xda app-developers app

n7of9 said:
connect phone to pc via usb
go to Device Manager
right click anything that looks like the phone and uninstall drivers
unplug phone
restart pc
connect phone to pc via usb
let it install drivers automatically
fixed?
Click to expand...
Click to collapse
Nope, still nothing. My Razr HD comes up fine, but not the Nexus 5. Think it's a conflict in drivers?

Tweaken said:
Think it's a conflict in drivers?
Click to expand...
Click to collapse
definitely...the only time i ever had Nexus driver issues was when i changed from HTC to Nexus
the best i can offer is how i fixed it...get a copy of Wug's Nexus Root Toolkit and follow his instructions from deleting all other drivers and installing new ones...he offers (i think) 4 different options and you just work your way through them until one stick (the RAW drivers always work for me)
and note that the Toolkit doesn't work on 4.4 yet, so only use it to clear and update drivers
http://forum.xda-developers.com/showthread.php?t=1766475

n7of9 said:
definitely...the only time i ever had Nexus driver issues was when i changed from HTC to Nexus
the best i can offer is how i fixed it...get a copy of Wug's Nexus Root Toolkit and follow his instructions from deleting all other drivers and installing new ones...he offers (i think) 4 different options and you just work your way through them until one stick (the RAW drivers always work for me)
and note that the Toolkit doesn't work on 4.4 yet, so only use it to clear and update drivers
http://forum.xda-developers.com/showthread.php?t=1766475
Click to expand...
Click to collapse
Sweet, that did it. Uninstalled Motorola drivers, uninstalled Google ADB driver, restarted, plugged in phone, voila!

Tweaken said:
Sweet, that did it. Uninstalled Motorola drivers, uninstalled Google ADB driver, restarted, plugged in phone, voila!
Click to expand...
Click to collapse
n7of9 said:
definitely...the only time i ever had Nexus driver issues was when i changed from HTC to Nexus
the best i can offer is how i fixed it...get a copy of Wug's Nexus Root Toolkit and follow his instructions from deleting all other drivers and installing new ones...he offers (i think) 4 different options and you just work your way through them until one stick (the RAW drivers always work for me)
and note that the Toolkit doesn't work on 4.4 yet, so only use it to clear and update drivers
http://forum.xda-developers.com/showthread.php?t=1766475
Click to expand...
Click to collapse
Thank you n7of9 the link you provided worked for me.

Another solution...
Plug the phone into your computer. Go to "Device Manager" and find the Nexus <x> device where-ever it's listed (may not be called "Nexus...", though on my machine with the real drivers it was).
Right click, choose "update driver software"
Select "browse my computer"
Select "let me pick..."
Choose the option. "usb composite device"
Apply and close all windows.
Disconnect and reconnect the phone to the computer.
The phone will now allow you to move files to it properly. Something weird with proper phone drivers. I believe you need to reverse this if you need to use ADB again in the future.

This worked and also fixed another popular issue
Not only does this fix the MTP connection issue to move folders to root folder. But it also now allows me to see the preview thumbnails of my media! This was a huge problem on my other phones and many many people including me were never able to fix that. All the ideas to get around or create USB Mass Storage instead of MTP after 4.1 were fails.
Cosmicevo said:
Another solution...
Plug the phone into your computer. Go to "Device Manager" and find the Nexus <x> device where-ever it's listed (may not be called "Nexus...", though on my machine with the real drivers it was).
Right click, choose "update driver software"
Select "browse my computer"
Select "let me pick..."
Choose the option. "usb composite device"
Apply and close all windows.
Disconnect and reconnect the phone to the computer.
The phone will now allow you to move files to it properly. Something weird with proper phone drivers. I believe you need to reverse this if you need to use ADB again in the future.
Click to expand...
Click to collapse

Cosmicevo said:
Another solution...
Plug the phone into your computer. Go to "Device Manager" and find the Nexus <x> device where-ever it's listed (may not be called "Nexus...", though on my machine with the real drivers it was).
Right click, choose "update driver software"
Select "browse my computer"
Select "let me pick..."
Choose the option. "usb composite device"
Apply and close all windows.
Disconnect and reconnect the phone to the computer.
The phone will now allow you to move files to it properly. Something weird with proper phone drivers. I believe you need to reverse this if you need to use ADB again in the future.
Click to expand...
Click to collapse
Worked perfect, thanks

what worked for me
In windows 8.1
I plugged in my nexus and browsed to device manager in control panel
I uninstalled the device (and deleted the driver)
I unplugged the nexus 5
I plugged it back in
Windows recognized it as a proper MTP device
I think the problem was something to do with windows recognizing it as an ADB device (I had installed the toolkit before etc)
This fixed it for me

openlatedotorg said:
Worked perfect, thanks
Click to expand...
Click to collapse
Hi,
I did all the steps mentioned, and ran the driver test - everything works fine, success.
However, I still cant see my device in "This PC"...
What is even more weird, that it only disappeared couple of days ago, and I didnt do anything to my computer at all....
Any other way to get devices to show? (Nexus 10 or Nexus 4 stopped showing too).....
Maybe problem is that it is being shows as ACER ADB Interface? But i cant change that to MTP anyway..

[Q] Windows 8.1

Hey Guys,
I cant seem to be able to access the N5 as a media device on windows 8.1.. just wondering if anyone got it working?
I've tried searching around and tried a few things like trying to download MTP drivers from Nexus 7 but nothing seems to work.

nexarz said:
Hey Guys,
I cant seem to be able to access the N5 as a media device on windows 8.1.. just wondering if anyone got it working?
I've tried searching around and tried a few things like trying to download MTP drivers from Nexus 7 but nothing seems to work.
Click to expand...
Click to collapse
Same for me.. Windows 7 here.

works fine on 8.1 here

Oddly enough, I have no issues on my Windows 8.1 Desktop but on my 8.1 laptop, it doesn't work at all. Both we're upgraded from 8.0, no fresh install. Both worked before. Obviously something more to it than just Windows 8.1

It shows "Google Nexus ADB Interface" even when I disabled USB Debugging.
Sent from my Nexus 5 using XDA Premium 4 mobile app

nexarz said:
Hey Guys,
I cant seem to be able to access the N5 as a media device on windows 8.1.. just wondering if anyone got it working?
I've tried searching around and tried a few things like trying to download MTP drivers from Nexus 7 but nothing seems to work.
Click to expand...
Click to collapse
https://dl-ssl.google.com//android/repository/latest_usb_driver_windows.zip
This is the driver I installed on my Win 8.1 machine and also a Win XP machine. Both work for adb/fastboot and for storage access.

Spunky_Monkey said:
https://dl-ssl.google.com//android/repository/latest_usb_driver_windows.zip
This is the driver I installed on my Win 8.1 machine and also a Win XP machine. Both work for adb/fastboot and for storage access.
Click to expand...
Click to collapse
PC says it's the same like I have installed.

Plug the Nexus 5 into your computer with the USB cable.
Open Device Manager.
Find "Android Device" near the top and expand the node. Double click on "Android Composite ADB Interface".
In the properties window that pops up, uninstall and delete the current driver.
Unplug your Nexus 5 and plug it back in.

lets_zock said:
PC says it's the same like I have installed.
Click to expand...
Click to collapse
Try putting your phone back to usb debug mode and then from device manager uninstall the Google Nexus ADB Interface. Then at the top under actions click scan for hardware changes and try to install the driver again when it finds the device. I know i had to do this on mine.

wmh said:
Plug the Nexus 5 into your computer with the USB cable.
Open Device Manager.
Find "Android Device" near the top and expand the node. Double click on "Android Composite ADB Interface".
In the properties window that pops up, uninstall and delete the current driver.
Unplug your Nexus 5 and plug it back in.
Click to expand...
Click to collapse
Thanks, it helped halfways. It can't find drivers for Nexus 5 and MTP.
EDIT: Deactivated USB-Debugging and it worked! Thanks!

I´m looking for mass storage mode.
All I was able to do was to get working ADB mode and MTP mode. Totally easy....but whatever I do....no mass storage mode?!

Where did you read that? Google suppressed the mass storage mode with jb, since 'internal sdcard' is merely a folder of data partition mounted as a virtual vfat disk through fuse.
I can't imagine they suppressed a feature from android filesystem setup to introduce it back on a single flagship device.
And even if I'm not dev, every dev questioned about this said it's impossible with this filesystem setup. It would be only possible with a separate partition, (like on my sgs3) with external sdcard for example.

i have an original 8.1 and an win8 upgraded to 8.1...
i cant install it on both machines
tried with usb debugging on and off. i can see the device, but i cant install it. only adb drivers. but i want to use USB storage (MTP)
kinda embarassing: good old windows xp, running on a 10+ year old laptop performs perfectly fine-.-

Thanks for the help.. got the ADB installed but when in debugg mode MTP comes up but wont install drivers for it.. when debug is off MTP doesnt sho in device manager.. i just want to get MTP working

wmh said:
Plug the Nexus 5 into your computer with the USB cable.
Open Device Manager.
Find "Android Device" near the top and expand the node. Double click on "Android Composite ADB Interface".
In the properties window that pops up, uninstall and delete the current driver.
Unplug your Nexus 5 and plug it back in.
Click to expand...
Click to collapse
This user speaks truth.

Tried Plug in, uninstall and delete android composite ADB, replugged in phone.. windows goes into a installing nexus 5... but then after in device manager nexus 5 still has a yellow ! on it and saying drivers not installed... tried this in debugging mode but all that happens is MTP and Nexus5 pops up in device manager with the yellow !... im running windows 8.1

nexarz said:
Tried Plug in, uninstall and delete android composite ADB, replugged in phone.. windows goes into a installing nexus 5... but then after in device manager nexus 5 still has a yellow ! on it and saying drivers not installed... tried this in debugging mode but all that happens is MTP and Nexus5 pops up in device manager with the yellow !... im running windows 8.1
Click to expand...
Click to collapse
having a similar issue on windows 8.1. unable to access device, either shows as nexus5 or mtp depending on debugging mode

wmh said:
Plug the Nexus 5 into your computer with the USB cable.
Open Device Manager.
Find "Android Device" near the top and expand the node. Double click on "Android Composite ADB Interface".
In the properties window that pops up, uninstall and delete the current driver.
Unplug your Nexus 5 and plug it back in.
Click to expand...
Click to collapse
THANK YOU!
I've been screwing around with this thing for an hour trying to copy a new ROM to it, and I couldn't get it to work. This took 2 seconds!
Thank you again!

ahfunaki said:
THANK YOU!
I've been screwing around with this thing for an hour trying to copy a new ROM to it, and I couldn't get it to work. This took 2 seconds!
Thank you again!
Click to expand...
Click to collapse
You're welcome , just glad i could be of assistance.
Regards.

it still doesnt work for me...the only device it works on is my pre-stoneage-laptop...so eerytime i want to transfer something i first have to put it on my laptop, and then on the N5....
cant somebody just kinda copy and paste their drivers? If thats possible i need Win 8.1 Pro N x64

[Q] phone not recognized as storage when connected to laptop

HI all, I seem to have a problem getting my laptop (ubuntu 12.04) to recognize my phone as storage when connected via USB. Here's what happened. I have already enabled USB debugging and USB debugging notify. When I plugged the phone to my laptop I got the usual message on the screen of my phone an when I clicked on it there were 2 tick boxes: one to recognize the phone as camera (that by the way worked) and the other one that recognized the phone as storage: when ticked nothing happened on my laptop, so I unticked both and now that bloody message is not coming up anymore on my phone, I only got one which says "USB debugging connected". ANy idea?
thanks

Disable the USB debugging... It's not needed for storage connection.
Sent from my One using XDA Premium 4 mobile app

HI thanks, ok fair enough but somehow I seem to have messed up with it and I would like to fix it if I can: I can't get the usb debugging mode message up when I connect the phone and the laptop doesn't recognize it as storage, not only ubuntu but even windows! could it be a matter of drivers? If so where can I get them from?
thanks

Menu>Storage>*menu on the upper right corner*>USB computer connection>*check box MTP/PTP*

happygolucky919 said:
Menu>Storage>*menu on the upper right corner*>USB computer connection>*check box MTP/PTP*
Click to expand...
Click to collapse
Thanks. When I connect the device as PTP it gets connected but when I do it as MTP , computer shows the error that drivers are not installed.

I'm having a similar problem on my phone, there is no option to change USB computer connection, so phone not regonised when plugged into PC? Any ideas?

MTP is a proprietary and modern protocol, older or open source OS's will not support it out of the box. You will need the relevant drivers, not sure how to do it on older version of Ubuntu, may be worth looking in their forums (support is included in new version in the proprietary driver bundle). There are no drivers for Windows XP, but you can get them for Windows 7, I'll dig out the guide I have bookmarked somewhere.

IIIIkoolaidIIII said:
MTP is a proprietary and modern protocol, older or open source OS's will not support it out of the box. You will need the relevant drivers, not sure how to do it on older version of Ubuntu, may be worth looking in their forums (support is included in new version in the proprietary driver bundle). There are no drivers for Windows XP, but you can get them for Windows 7, I'll dig out the guide I have bookmarked somewhere.
Click to expand...
Click to collapse
Thanks. That would be of great help.

Dush123 said:
Thanks. That would be of great help.
Click to expand...
Click to collapse
Here are the three guides I have bookmarked relating to MTP, I think the first from Tom's Hardware should fix (download is in 3rd post).
http://www.tomshardware.co.uk/forum/50119-63-devices-working
http://forum.xda-developers.com/showthread.php?t=2390296
http://forum.xda-developers.com/showthread.php?t=2391236
Hope these help.
B
---------- Post added at 09:22 AM ---------- Previous post was at 09:21 AM ----------
Oh yeah the other thing I didn't mention is MTP honors your phones security, so if you have a secure lock it won't show up initially until screen is on and device is unlocked.

Same issue, no options under USB computer connection !
boringfrog said:
I'm having a similar problem on my phone, there is no option to change USB computer connection, so phone not regonised when plugged into PC? Any ideas?
Click to expand...
Click to collapse
Hi, boringfrog,
were you able to get the issue resolved ?
After the phone upgraded from 12.0-YNG1TAS17L to 12.0-YNG1TAS2I3, i am seeing the similar issue, my phone will only charge on a Laptop, i tried different cables, 2 laptops, uninstalled and re-installed drivers, nothing works, i did a dirty flash back to 12.0-YNG1TAS17L the issue still exists, i tried enabling and disabling ADB debugging etc...
Under storage options , under the three dots on the right i see the USB computer connection, upon hitting it , nothing happens, the storage page just refreshes... no options to mount as MTP....
Please help need to copy the data from phone to PC...

mkhanemkay said:
Hi, boringfrog,
were you able to get the issue resolved ?
After the phone upgraded from 12.0-YNG1TAS17L to 12.0-YNG1TAS2I3, i am seeing the similar issue, my phone will only charge on a Laptop, i tried different cables, 2 laptops, uninstalled and re-installed drivers, nothing works, i did a dirty flash back to 12.0-YNG1TAS17L the issue still exists, i tried enabling and disabling ADB debugging etc...
Under storage options , under the three dots on the right i see the USB computer connection, upon hitting it , nothing happens, the storage page just refreshes... no options to mount as MTP....
Please help need to copy the data from phone to PC...
Click to expand...
Click to collapse
Sorry it was a friends phone so I just returned it to him after try a few attempts. Can you not put your data into the cloud then you can access it on your PC? Good luck.

PC not recognizing OnePlus 2 after update to Oxigen 3.0.1
What seems to solve the problem is to pull down the notifications bar, which shows one notification which gives you multiple options for the USB. Please choose the file download option(usually the second option). Your OPT will show up on the PC.
Thanks and regards to all.

[Solved] USB suddenly stopped working

I have a Nexus 5 that I have had about a month now and I had the USB on it working before about a week ago. I plugged it in today and neither my desktop or laptop could recognize it anymore. Both computers are running Windows 8.1.1 and the issues seems to be new as I can neither get USB storage or ADB to find it. The closest I can get it to working is to switch the USB mode to PTP and it reads that but I don't want to pull photos off. When I have it in MTP, it makes the sound of it plugging in and my phone shows it is plugged into a computer but Explorer shows nothing and it says it is working normally in device manager. I've tried everything from enabling and disabling debugging, restarted both my phone and computer tried reinstalling the drivers (both by the computer automatically finding them and manually installing them) but nothing seems to work. Is it possible that Windows Update could of broke the drivers since my computer installed updates yesterday? I also have Linux on my laptop and it appears to read fine with Linux.

That's the exact issue. If you check in Device Manager you'll see it listed as 'ACER ADB Device' (or something like that). You have right-click on it, select update driver, manually check and go through the list option and choose the MTP driver and it'll work again (and with USB Debugging enabled if you don't usually have it on like me)
I theorise that it's happened cause the Acer driver is digitally signed and the Google ones aren't but I could be wrong. Either way, it's a PITA

EddyOS said:
That's the exact issue. If you check in Device Manager you'll see it listed as 'ACER ADB Device' (or something like that). You have right-click on it, select update driver, manually check and go through the list option and choose the MTP driver and it'll work again (and with USB Debugging enabled if you don't usually have it on like me)
I theorise that it's happened cause the Acer driver is digitally signed and the Google ones aren't but I could be wrong. Either way, it's a PITA
Click to expand...
Click to collapse
OK thanks. I'll give it a try because it was showing up as ACER ADB Device under device manager
EDIT: I updated the drivers and used the USB composit drivers instead and it got MTP working again. When I set it to USB composit, it installed Google's ADB drivers and the Nexus 5's USB drivers so everything is working again. Thanks for your help

EddyOS said:
That's the exact issue. If you check in Device Manager you'll see it listed as 'ACER ADB Device' (or something like that). You have right-click on it, select update driver, manually check and go through the list option and choose the MTP driver and it'll work again (and with USB Debugging enabled if you don't usually have it on like me)
I theorise that it's happened cause the Acer driver is digitally signed and the Google ones aren't but I could be wrong. Either way, it's a PITA
Click to expand...
Click to collapse
I can´t manually update driver because of this:

when i update the acer adb it says the driver is up to date and everything is all same. what to do?

Thanks! Thought I was going to go crazy. Worked for me...

i set the driver to MTP as mentioned above and the phone started to show up on the explorer but now i couldnt copy any files from my laptop to the
phone. It displays like that and if clicked yes then the copy wouldnt happen.what is the problem.

Uninstall driver, plug in device, tell windows to not auto install driver (or disconnect from internet), click to update or install driver, point to folder with drivers, install, all is done.

wangdaning said:
Uninstall driver, plug in device, tell windows to not auto install driver (or disconnect from internet), click to update or install driver, point to folder with drivers, install, all is done.
Click to expand...
Click to collapse
actually i did all the process above(when the phone was not appearing) and then i got to display the thing on the explorer. and shall i do it still what you say.

Big tree said:
actually i did all the process above(when the phone was not appearing) and then i got to display the thing on the explorer. and shall i do it still what you say.
Click to expand...
Click to collapse
That msg comes when you're in PTP mode I think...Only certain formats are supported.
Check under storage, expansion menu and make sure you are set to the first option...not PTP.
Above guy mentioned to have phone in USB debugging mode when setting up drivers.

If the device is showing then you need to point to the drivers for it (download them from google). I reinstalled windows a few days ago and had the acer issue (device first shows up in device manager as nexus 5 then switches to acer), windows wants it to be an acer device. Stop windows and then install the correct drivers,
For me I had to click the auto install in windows tray and tell it to stop. After a few times it worked.

No I'm connecting in MTP mode. Ahh its gettn irritating.