Hi,
I'm trying to install the USB driver under Windows7 64 using the instructions at nookdevs.com/NookColor_USB_ADB, but can't get the Android Composite ADB Interface driver to install (only get ADB Interface).
I turned USB debugging on using NookColor Tools.
Any ideas?
Thanks!
Adb is 50/50 for me. Sometimes it works and sometime it doesn't. Restart computer and try again.
Ok, I figured out this one by accident. The USB debugging setting goes away after the nook is unplugged from the computer! Even though in NookColor Tools it's still checked, you have to uncheck it and check it again.
So here's the steps to install the driver:
- get the driver and adb_usb.ini as described nookdevs.com/NookColor_USB_ADB
- go to NookColor Tools / Development, turn USB debugging off, then turn it back on
- plug your nook in, and do not unplug until you are done with all steps!
- go to Device Manager
- if you have installed Android ADB interface, uninstall it and check delete file when the confirmation comes up
- if you don't have Android ADB interface, then uninstall the USB Mass Storage driver that corresponds to your nook (easiest to identify is to unhook all USB stick and harddrives, then there should only one remain)
- select Action/Scan for Hardware Changes
- under Other devices, the NookColor should come up, right click and select Update Driver
- select Browse...
- select Let me pick...
- Select Have Disk and browse to the USB driver folder, select the .inf
- the Android Composite ADB interface should now be in the list, install it and enjoy
Hope this helps someone.
I gave up on ADB using my brand new Win7 pc. The only solution for me was to use my old xp laptop--connected the first time, would have saved me hours of frustration. Glad it worked for you with Win7.
This took me a couple hours of trying to stumble upon, too.
But now I have it installed on two win7 64 machines, so I'm pretty sure it works.
I wish the USB debugging mode would stick. That's what messed me up.
Related
Hey everyone,
I have been happily using android on nand for quite sometime, and everything has been going well. However, I must have the wrong adb driver installed on my windows 7 computer and can't seem to remove it fully or install the proper one ever. Every time I remove it from device manager, and plug it back in, windows finds it as an HTC composite device, and adb through command line can't find any devices, ever! I would really like to be able to use this feature for things like tethering and what not.
Also, if anyone has any information on how to tether using any OS, windows, mac or linux, I would greatly appreciate it, along with any applications that might be helpful! I have done proxoid in the past and it worked well, pdaNet looks like it might work, but again I don't have a connection to my windows computer!
Thanks in advance for all of the help!
I am using the android SDK usb driver for ADB, you just have to edit a file and add the vendor ID. I can do things like adb logcat, adb shell gives me odd characters in directory listings,I get a ? from adb devices, not sure what that is about.
C:\Documents and Settings\Administrator\.android\adb_usb.ini
Code:
# ANDROID 3RD PARTY USB VENDOR ID LIST -- DO NOT EDIT.
# USE 'android update adb' TO GENERATE.
# 1 USB VENDOR ID PER LINE.
0x0e79
0x0bb4
The 0e79 is for my Archos tablet, works fine there. 0bb4 is what showed up in device manager when I plugged in the phone.
I tried to install that driver for my Polaris and it doesn't work.
It shows "Installing Android Phone" while I have my device plugged in. It takes forever and seems that the USB connection hangs the driver install process, but as soon as I disconnect my device, Windows shows me an error message.
Instructions for Vista\Windows 7
For WinVista/Win7
These OS will install Android as a mass storage device. You must uninstall the driver and update to the android driver model.
Instructions:
1) Unplug all removable devices(thumb drive, sdcards, etc) beside the Android phone.
2) Locate "Device Manager", usually under "control panel"
3) Select "Universal Serial Bus Controllers"
4) Select USB Mass Storage Device.
Note: to check if you have the correct device, click on the details tab and select "compatible ids" under properties. There should be three items listed under value.
5) Select uninstall driver
6) Close the window. Now in device manager a new "Android Phone USB device" with a yellow! will appear... If not, Unplug your android device or select Action -> Scan.
Note: view optional steps below if you still have problem with the your windows automatically installing drivers.
7) Click on the "Android Phone USB device"
8) Select "browse my computer to driver software"
9) Under "search this location for driver", Browse for the location that you have unzip the android_usb_windows and select the corresponding folder for your system(AMD64 for 64bit systems or x86 for 32bit systems. Right click -> properties on "My Computer" to check which system you have)
The driver is now installed and is ready to use.r
***Optional.
1. Go to System under Control Pandel.
2. Click on Hardware Tab and Under "Device Installation" select “Never search windows update for drivers”, then OK.
3. Go to Enable debugging on your phone. (Settings->Applications->Development->USB debugging).
4. Run USBDeview and remove all instances of Android Phone
5. Unplug your phone, and plug it in again.
7. Continue on step 7) above.
To turn off search windows update in windows 7, use this link below
http://www.addictivetips.com/windows-tips/disable-windows-update-device-driver-search-prompt/
To turn off automatic driver installation in windows 7, use the link below
http://www.addictivetips.com/window...tomatic-driver-installation-in-windows-vista/
Unfortunately, it doesn't work for my Polaris. The whole driver installation process hangs while my device is connected. As soon as i disconnect it, it continues, but it then complaints about it being disconnected.
SuperJMN said:
Unfortunately, it doesn't work for my Polaris. The whole driver installation process hangs while my device is connected. As soon as i disconnect it, it continues, but it then complaints about it being disconnected.
Click to expand...
Click to collapse
mine hung as well, what i ended up doing was turnng off the automatic installation. Then uninstalled the adb interface driver that was already installed. Then turning back on automatic installation. Then plugging phone back in and as it was installing automatically, manually installing the adb interface driver at the same time. Eventally the automatic install would error out and the manual install would work. It took like 15 or 20 minutes for it to finish.
when i uninstalled the adb interface, it turned into ''android phone'' in device manager. That was the driver i manually installed while the phone was automatically installing. I know it dont make much sense but it worked for me.
It looks like that will be my fate as well. It also says, that when I do the manual install of the ADB drivers that I already have the most current version installed!!! OH well, keep trying!
Same behavior on my pc with windows 7 32-bits.
When I have lucky the adb driver is connected (working correctly) for a few minutes and then it's disconnected.
i've tried various things to install adb driver, since last night but i've got nothing. i can't install adb driver for my xperia arc.
i installed sdk manager and usb driver. but when i try to install or update driver, i always see this message like "you're using the latest version". So i can't install it.
and also i've tried to uninstall driver and unplugged / plugged my device. then w7 automatically install driver. so i can't install adb driver again.
i want to root my phone, using this way at this link http://forum.xda-developers.com/showthread.php?p=18805560#post18805560
so i must install adb driver, please help me.
thanks everybody
edit: i've windows 7 home premium, 64-bits
I installed the usb drivers for my nook as per the instuctions in this guide: http://nookdevs.com/NookColor_USB_ADB#Windows_XP.2C_Vista_and_7
It seems to have worked and in device manager "ANdroid composite ADB device" shows up under Android Phone.
But when i type adb devices when my nook is plugged in, i still dont get and devices there.
Im running 64 bit Windows 7 on an Intel Core i7 machine.
I couldn't get the ADB drivers to work via those instructions either. Luckily we have people around here that are MUCH smarter than I am.
http://forum.xda-developers.com/showthread.php?t=910008&highlight=adb+driver+install
Follow the instructions and install the software from that thread, worked for me great.
I am having the same problem here. It seems like everything is installing fine. I deleted the old usb mass storage device, installed everything, but then when I try to do adb devices, I get a blank line. No serial number. I then tried adb wireless, I connected using adb connect 192.168.2.4 and it said connect it was connected. I then ran adb devices and it spit back that it was connected to that ip address but it still doesn't give me a serial number.
This is what I get:
C:\android-sdk-windows\platform-tools>adb devices
* daemon not running. starting it now on port 5037 *
* daemon started successfully *
List of devices attached
C:\android-sdk-windows\platform-tools>
Sorry for the multiple posts.
Here is what I get if I try to connect using adbwireless:
C:\android-sdk-windows\platform-tools>adb connect 192.168.2.4:5555
already connected to 192.168.2.4:5555
C:\android-sdk-windows\platform-tools>adb devices
List of devices attached
192.168.2.4:5555 device
C:\android-sdk-windows\platform-tools>
EDIT: HALLELUJAH!!
I fixed it. Actually I didn't fix it, I just followed some instructions from another user that was having the same problem and finally figured out the very weird thing that installing the drivers did. Anyway, here is the solution from hacku:
Originally Posted by hacku View Post
Thanks for this...
EDIT 1:
I followed your instructions to a T and I still can't get ADB to see my NC. After uninstalling all instances of Nook in my device manager, unplugging it and plugging it back in, it adds all the same devices:
Under Disk Drives it lists B&N Ebook Disk USB Device (twice)
Under Portable Devices it lists MyNookColor
Under USB Controllers it lists USB Mass Storage Device
My PC is Windows 7 Ultimate 64bit. Running Nook Color 1.1.0 rooted and overclocked to 1.1Ghz. Any help will be greatly appreciated.
EDIT 2:
So I decided to pull the MicroSD card to simplify things. Uninstalled all instances of Nook from Device Manager and scanned for new hardware. This time I noticed that Windows detected it as a Nook, but then would install the drivers and it would show the same USB Mass Storage Device and the two instances of B&N Disk USB Device. I also noticed that by uninstalling the driver of the USB Mass Storage Device automatically deleted the other two instances under Disk Drives. So I updated the USB Mass Storage Device driver and this time I was able to install the drivers provided, but now it only shows up as an Android Phone > Android ADB Interface (not Composite), but I'm still not able to see it under adb devices.
Help?
EDIT 3:
GOT IT WORKING!!!
For those of you having this same problem this is what I did:
1. Right Click Android ADB Interface (it won't say Composite)
2. Select Update Update Driver Software
3. Click on Browse My Computer For Driver Software
4. Click on Let me pick from a list of device drivers on my computer
5. In the box that pops up click on USB Composite Device
6. Click Next
It now installed the USB Composite Device driver and changes your Android Phone to Android Composite ADB Device.
Open up Command Prompt and type adb kill-server then adb devices and your Nook Color will now show up.
Hope this helps some of you out.
I'm looking to port app restores - mostly game saves - from my old phone to the Droid Turbo. I've used Helium in the past but I can't get the Turbo to connect to Windows 7 yet. I've been trying to use the drivers linked from the Helium URL and here, but without success.
Anyone have luck tracking down USB drivers?
Any suggestions other than Helium?
Update:
Looks like the Motorola drivers started working as soon as I posted this (of course...).
This one was driving me nuts the last two days. On Win8.1 x64, the driver wouldn't auto-load when the device was plugged in. Until I saw your edit reason, I didn't even think to go through the manual device list and select the driver manually. "ADB Interface/Mot Composite ADB Interface" worked for me, as well.
Also, if you change your USB Storage mode on the phone, it may also change how the ADB Interface is detected. I had to manually add the ADB Interface driver a second time when I turned on MTP mode for the USB Storage connection. I had had it previously disabled while trying to figure out the ADB issues, once I had ADB working, I re-enabled MTP and subsequently Windows "forgot" the ADB device driver again.
For others: I had to go through the device manager, pick the unknown adb device and update drivers, pick drivers, select the clockworkmod section on the left and instead of mot composite I had to use the first option, android composite adb interface. Now my mtp connection works. Haven't tried reconnecting yet so it may well forget the drivers again, but at least I know what to do now!
Need the drivers from google sdk kit. Just google search installing adb drivers. I used helium fine.
I'm running XP on my machine. Connected USB cable from phone to PC. Selected Media Device (MTP) from drop down notification. Windows went through the general search for drivers. No dice. I have selected/de-selected USB debugging in the Developer Settings. Nothing each time.
Went to Motorola's support page , installed Motorola Device Manager, no dice again. Selected/de-selected USB Debugging in the developer section. Am I missing something here? Any help would be much appreciated. Thanks.
Give this a try - I was able to get it working on XP...
akita17 said:
I'm running XP on my machine. Connected USB cable from phone to PC. Selected Media Device (MTP) from drop down notification. Windows went through the general search for drivers. No dice. I have selected/de-selected USB debugging in the Developer Settings. Nothing each time.
Went to Motorola's support page , installed Motorola Device Manager, no dice again. Selected/de-selected USB Debugging in the developer section. Am I missing something here? Any help would be much appreciated. Thanks.
Click to expand...
Click to collapse
So I was having issues with the drivers on a Win XP machine as well. Here's what finally did it for me:
1. Uninstall drivers from control panel --> Add remove programs...
2. Restart Computer - make sure phone is disconnected from USB
3. Install Motorola Device Manager Software (again)
4. With phone still disconnected from USB go into your phone Settings --> Storage --> Top right three button menu --> USB computer connection. Make sure Media Device (MTP) is checked AND make sure Software Installation is turned OFF.
5. Plug in phone to USB
6. Do not search online for drivers, just let it install recommended drivers. It should find the correct drivers and you should be able to see it as a media player.
This is how I was able to get mine to work - I hope it works for you as well.
Good Luck - and enjoy your Turbo! :good:
Hey Chadster,
Thanks for the tip. I'll give this a go and report back.
In the interim, i did install BitSync on my PC and Turbo to transfer files over which works flawlessly.
akita17 said:
Hey Chadster,
Thanks for the tip. I'll give this a go and report back.
In the interim, i did install BitSync on my PC and Turbo to transfer files over which works flawlessly.
Click to expand...
Click to collapse
Never tried BitSync - although I haven't had any issues with transfer of files, so there wasn't a need for me to search out for a different solution.
For what it's worth - just installed MDM on my Win 8.1 laptop and things connected even easier than with the WinXP machine.
chadster1976 said:
So I was having issues with the drivers on a Win XP machine as well. Here's what finally did it for me:
1. Uninstall drivers from control panel --> Add remove programs...
2. Restart Computer - make sure phone is disconnected from USB
3. Install Motorola Device Manager Software (again)
4. With phone still disconnected from USB go into your phone Settings --> Storage --> Top right three button menu --> USB computer connection. Make sure Media Device (MTP) is checked AND make sure Software Installation is turned OFF
5. Plug in phone to USB
6. Do not search online for drivers, just let it install recommended drivers. It should find the correct drivers and you should be able to see it as a media player.
This is how I was able to get mine to work - I hope it works for you as well.
Good Luck - and enjoy your Turbo! :good:
Click to expand...
Click to collapse
Hello Chadster, at Step 4, what do you mean by making sure Software Installation is OFF? Where do we do that?
Thanks!
Hey guys, weird stuff going on here.
Downloaded the latest Android USB drivers as well as the SDK. When updating the device from the device manager, ADB drivers loaded fine, but MTP drivers and "Nexus 6" (camera mode) drivers will not install no matter what I try. USB debugging mode or not, no dice.
What I did find odd, is that when opening the android_winusb.inf file that was packaged in the latest usb drivers, there is no mention of a Nexus 6 phone inside - which explains why the drivers won't install See screenshots below.
http://i.imgur.com/qmgxwsd.png
http://i.imgur.com/9NGYxsR.png
I'm not sure if I feel comfortable "hacking" the inf file in order flash my phone, but maybe it would be ok Is this a screw up on Google's part or am I way off base here?
wfujay said:
Hey guys, weird stuff going on here.
Downloaded the latest Android USB drivers as well as the SDK. When updating the device from the device manager, ADB drivers loaded fine, but MTP drivers and "Nexus 6" (camera mode) drivers will not install no matter what I try. USB debugging mode or not, no dice.
What I did find odd, is that when opening the android_winusb.inf file that was packaged in the latest usb drivers, there is no mention of a Nexus 6 phone inside - which explains why the drivers won't install See screenshots below.
http://i.imgur.com/qmgxwsd.png
http://i.imgur.com/9NGYxsR.png
I'm not sure if I feel comfortable "hacking" the inf file in order flash my phone, but maybe it would be ok Is this a screw up on Google's part or am I way off base here?
Click to expand...
Click to collapse
I'm having similar issues, laptop running win 7 can't see Nexus 6, DL'd drivers, even tried Motorola for drivers but although showing in device manager as installed no connection
At least they installed for you. The drivers don't even recognize my device. I still get a yellow Nexus 6 in device manager with no usable connection. Ugh...
Sent from my Nexus 6 using Tapatalk
Seems to be a lot of this going around. I'm on win 8.1. I couldn't get the drivers to work via the sdk. Then I tried the Google and Motorola drivers. After deleting the devices on device manager I finally got the N6 to connect via mtp. However, I can't the computer won't connect via mtp if USB debugging is on. On top of that I can't get adb to even see the phone. I would suspect it's more of a Windows problem at this point. I need to do some more testing from another pc.
Sent from my Nexus 6 using XDA Free mobile app
Have any of you tried using Wug's Toolkit?
http://forum.xda-developers.com/showthread.php?t=2947452
Managed to connect via PTP eventually by uninstalling and reinstalling drivers, seems to work with PTP and USB debug on, but not with MTP
wfujay said:
Hey guys, weird stuff going on here.
Downloaded the latest Android USB drivers as well as the SDK. When updating the device from the device manager, ADB drivers loaded fine, but MTP drivers and "Nexus 6" (camera mode) drivers will not install no matter what I try. USB debugging mode or not, no dice.
What I did find odd, is that when opening the android_winusb.inf file that was packaged in the latest usb drivers, there is no mention of a Nexus 6 phone inside - which explains why the drivers won't install See screenshots below.
http://i.imgur.com/qmgxwsd.png
http://i.imgur.com/9NGYxsR.png
I'm not sure if I feel comfortable "hacking" the inf file in order flash my phone, but maybe it would be ok Is this a screw up on Google's part or am I way off base here?
Click to expand...
Click to collapse
This may not apply to you at all, but with the mess of Android drivers I have to install over time I've finally figure out a solution when something is not installing correctly. Did you try right clicking on the Nexus 6 (I'm assuming that has a yellow exclamation point) going to:
Update Driver Software > Browse my computer... > Let me pick from a list > Portable Devices > and find a compatible MTP driver in there
I'm saying Portable Devices specifically because that's how my Nexus 6 shows up as (as an MTP device) in the device manager.
Use the universal naked drivers. I have multiple devices and the drivers don't cooperate with each other but since I installed the naked drivers I have had any issues.
http://www.xda-developers.com/andro...r-solves-your-adb-driver-problems-on-windows/
---------- Post added at 05:46 PM ---------- Previous post was at 05:45 PM ----------
http://forum.xda-developers.com/goo...nt/adb-fb-apx-driver-universal-naked-t2513339
I fixed it! Wug's toolkit didn't work, although I'm about to use it to unroot, lock, and return my phone to factory state since it has to be taken back to the AT&T store to be replaced due to a screen defect. Hope they don't freak out about the death star being scratched off, lol.
Anyway, oddly enough the problem is because I'm using Windows 8.1 N, which doesn't come with Windows Media Player or any of the media features. Installing the Media Feature Pack for N and KN versions of Windows 8.1 sorted it out. Installed, rebooted, done. I can now access the device in any mode and the device driver errors are gone.
So if anyone is having the same issue with Windows 8.1 N, download and install this: http://www.microsoft.com/en-us/download/details.aspx?id=42503
Reboot and enjoy!
thanks
EvanVanVan said:
This may not apply to you at all, but with the mess of Android drivers I have to install over time I've finally figure out a solution when something is not installing correctly. Did you try right clicking on the Nexus 6 (I'm assuming that has a yellow exclamation point) going to:
Update Driver Software > Browse my computer... > Let me pick from a list > Portable Devices > and find a compatible MTP driver in there
I'm saying Portable Devices specifically because that's how my Nexus 6 shows up as (as an MTP device) in the device manager.
Click to expand...
Click to collapse
Same thing was going on with my nexus 6 and I tried what you said and updated everything. Now the MTP works. thanks
Update Driver Software > Browse my computer... > Let me pick from a list > Portable Devices > and find a compatible MTP driver in there
Click to expand...
Click to collapse
Thank you so much ! MTP Works now. Hail to the king
EvanVanVan said:
Update Driver Software > Browse my computer... > Let me pick from a list > Portable Devices > and find a compatible MTP driver in there
I'm saying Portable Devices specifically because that's how my Nexus 6 shows up as (as an MTP device) in the device manager.
Click to expand...
Click to collapse
Ran into the same issue initially when I was trying to root my Nexus 6. Wug's didn't work, and neither did the naked universal drivers. Added the Nexus 6 ID to the inf and still didn't work.
Had to install the Motorola driver kit, and then go through the drivers as above to find a Motorola that finally worked; while the Motorola driver is just a wrapper for some Microsoft driver that normally comes built into Windows since Windows 7.
Nexus 6 Driver (ADB, Fastboot and MTP) for Windows and MAC
http://www.theandroidsoul.com/nexus-6-driver-adb-fastboot-mtp-windows-mac-68355/
I discovered the following troubleshooting tip listed below (amongst others) at the website above. It worked flawlessly with my brand new unlocked stock Motorola NEXUS-6 (XT-1103) and Windows-7 PC. Thank you and big props to the developer(s) who posted it!
1.Connect your Nexus 6 to computer with a USB cable and open Device manager on your computer.
2.Look for ‘Android Composite ADB Interface‘ entry, right-click and select uninstall from the context menu.
3.In the uninstall pop-up that appears, tick ‘Delete the driver software for this device’ checkbox and press the “Ok” button.
4.Disconnect your phone from your computer.
5.Disable USB debugging on your Nexus 6 from Settings » Developer options » un-tick ‘USB debugging’ checkbox.
6.Put your Nexus 6 in MTP mode (It should be in MTP by default unless you selected the Camera (PTP) mode).
7.Connect your Nexus 6 to the computer again, and let the computer re-install drivers automatically. If it doesn’t re-installs driver, try toggling the ‘USB debugging’ option on your device.
Same here. Nexus 6 stock lollipop 5.1.1 with unlocked bootloader. I thought it was my personel windows 7 pc. But no its any pc I try to connect to. Found that out because I work at a big business full of windows pc's. I remember at one point not having this problem at all. Don't know if it was before one of the lollipop updates but I remember I used to connect my phone at work on any pc the pc would automatically open MTP asking me what I wanted to do. That was without adb turned on. I've tried everything searched everywhere, installed,uninstalled drivers from Google, Motorola etc. Even tried wugfresh's instructions. My pc does not recognize my phone at all. Mtp, Adb, Fastboot, nothing. Weird thing is I also have a nexus 5 and as soon as I connect it its recognized. Don't know if it maybe the cable that's the only thing I haven't tried since my cables are not Motorola cables, or nexus 6 original cable as that is the way I bought it. But it used to connect. Now I'm stuck, at a loss. Don't get it, called Motorola, Google, T-Mobile. I think they know nothing about phones as when I tell them the problem they look at me like I'm talking Chinese. If anyone knows what the problem is and have been able to fix it please hit me up @ [email protected] Just about to give up. I just don't understand what the problem maybe. Running stock lollipop 5.1.1 with unlocked bootloader never rooted. Thanks and hope someone can help.
I had the same issue. I installed the latest google drivers from the Android SDK and my computer would not recognize my Nexus 6. I couldn't use fastboot or anything. I was able to fix this though. With my Nexus 6 hooked up to my computer, I opened device manager. There was the "unknown device" which was my Nexus 6 obviously. I right clicked on it and attempted to install the driver, the automatic driver installation method could not find it. I had to point it directly to the file. The file is located in the android-sdk files. I had to point it to c:/android-sdk/extras/google Obviously location will vary depending on where you installed the android-sdk. Just make sure to only point it to extras/google. I wen't further in the first attempt and it didn't work. I hope this helps. I suck at explaing stuff.
Long Island NOOBIE said:
http://www.theandroidsoul.com/nexus-6-driver-adb-fastboot-mtp-windows-mac-68355/
I discovered the following troubleshooting tip listed below (amongst others) at the website above. It worked flawlessly with my brand new unlocked stock Motorola NEXUS-6 (XT-1103) and Windows-7 PC. Thank you and big props to the developer(s) who posted it!
1.Connect your Nexus 6 to computer with a USB cable and open Device manager on your computer.
2.Look for ‘Android Composite ADB Interface‘ entry, right-click and select uninstall from the context menu.
3.In the uninstall pop-up that appears, tick ‘Delete the driver software for this device’ checkbox and press the “Ok” button.
4.Disconnect your phone from your computer.
5.Disable USB debugging on your Nexus 6 from Settings » Developer options » un-tick ‘USB debugging’ checkbox.
6.Put your Nexus 6 in MTP mode (It should be in MTP by default unless you selected the Camera (PTP) mode).
7.Connect your Nexus 6 to the computer again, and let the computer re-install drivers automatically. If it doesn’t re-installs driver, try toggling the ‘USB debugging’ option on your device.
Click to expand...
Click to collapse
This didn't work the first or second time. I did steps 2 through 7 3 times and then it worked. I must have had a lot of drivers installed.
So if it doesn't work the first time, keep uninstalling the drivers and try again and again. Worse case scenario, you have to install the drivers again. hope this helps.
I want to add my own tale to his thread with the hope that it will help someone. I could not see the Nexus 6 when I set MTP mode or MIDI mode. The phone showed up on the PC when I selected PTP (camera) mode. In my case, I had four external USB3 hard drives connected. I finally turned off the hard drives and then MTP mode would be visible, both as a Portable Device, named Nexus 6, in the Device Manger, and as the same under My Computer in Windows Explorer. After Imy PC recognized the Phone in MT mode, I tuned on the external drives and all were visible.