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I already asked this but couldn't get a proper answer. I don't get this screen anymore when I attach GT 10.1 to any USB. I am going to root my tab, and I want to know if this is normal. To better explain myself this time I am attaching a picture of my SGS2 on USB connection. This is what I am not seeing anymore on my tab.
Sent from my GT-P7510 using xda premium
Is USB Debugging on? This may be the cause.
Thanx but no. It is off and I can sync with KIES or see my tablet in windows explorer. I can say that I prefer this. I don't need USB debugging anymore. I can do anything with my tab, still connected to USB and dont need to press home button to return to tab. As though KIES mode is disabled and still active. I wonder if this is an abnormality. I am scared to root my tab.
Sent from my GT-P7510 using xda premium
C'mon guys. No one here in the same boat? Just care to answer. I just rooted my tab fine, but this issue is really occupying my mind. It seems that my tab is stuck at debugging mode. When I check debug, my tab disapears from windows explorer. Nothing, nada! When I uncheck debug, it is there again as a phone icon. Titanium backup tells me to put debug on, and after I check it, it still tells me to check it.... but does the backup fine. I am really confused here. Please... someone...explain. Otherwise my wife will put me in a white jacket with arms tied. You know what I mean.
Sent from my GT-P7510 using xda premium
Thats for sure, I have no PC connection when in debugging mode. Is that normal? There is no option to mount the TAB. Only an icon, bottom right, shows debugging mode and when touched it gives you the option to quit debugging mode.... and I am really surprised no one has any idea. Where are the gurus?
I'm confused, what was the question again? You answered yourself so many times, that I'll address only the last question.
Even when debugging is on you have an USB connection. You can access your Tab through ADB but MTP won't work. And since there is no USB mass storage mode you can't access /sdcard via Win Explorer while debugging is active.
Have I answered myself? How my ignorance can answer itself? If someone told me, "There is nothing wrong with your tab" I would have been relieved. Just tell me this: With which update have I lost the MPT screen? (See the attached pic.) And secondly, when in debugging mode, shouldn't I see my device in windows explorer? I used to see it, and I still see my SGS2 when debug on. Thanx for answering BTW.
In the past I could enable USB debug and my USB storage would not auto mount to the computer it was connected to. Now no mater what I try with the S5 it will not allow me to disable this automount behavior, even while on the lock screen. I find this to be a HUGE issue with security anyone who can grab my phone can access all the files on it very quickly.
Has anyone figured out how to disable this?
Sorry if this has been asked already, I did search.
Errant33 said:
In the past I could enable USB debug and my USB storage would not auto mount to the computer it was connected to. Now no mater what I try with the S5 it will not allow me to disable this automount behavior, even while on the lock screen. I find this to be a HUGE issue with security anyone who can grab my phone can access all the files on it very quickly.
Has anyone figured out how to disable this?
Sorry if this has been asked already, I did search.
Click to expand...
Click to collapse
First you need to enable developer options by going to settings>about phone and tapping on the build number about 7 times, a pop up will come saying they are enabled. Then go there and scroll down and you should see it, about the 5th option down
Sent from my SM-G900V using XDA Free mobile app
Dennisg34 said:
First you need to enable developer options by going to settings>about phone and tapping on the build number about 7 times, a pop up will come saying they are enabled. Then go there and scroll down and you should see it, about the 5th option down
Sent from my SM-G900V using XDA Free mobile app
Click to expand...
Click to collapse
I think you mis-understood my question, automount of usb is still occurring with debug mode enabled. Nothing I do will disable it and it happens even on the lock screen. I have already enabled developer options, was already familiar with the press 7 times option....although many are not!
Errant33 said:
I think you mis-understood my question, automount of usb is still occurring with debug mode enabled. Nothing I do will disable it and it happens even on the lock screen. I have already enabled developer options, was already familiar with the press 7 times option....although many are not!
Click to expand...
Click to collapse
You're right, I'm not understanding the question, and I still don't understand what you're trying to say. Can you be more specific with what steps you do and what results you are looking for?
Sent from my SM-G900V using XDA Free mobile app
Errant33 said:
I think you mis-understood my question, automount of usb is still occurring with debug mode enabled. Nothing I do will disable it and it happens even on the lock screen. I have already enabled developer options, was already familiar with the press 7 times option....although many are not!
Click to expand...
Click to collapse
1. Plug USB into pc and phone
2. Browse to phone and see all files(Behavior I want to stop)
Basically I want charge only mode till I select for USB to connect via MTP or PTP
Errant33 said:
1. Plug USB into pc and phone
2. Browse to phone and see all files(Behavior I want to stop)
Basically I want charge only mode till I select for USB to connect via MTP or PTP
Click to expand...
Click to collapse
Hmm, have you tried deselecting the options that pop up once you plug the USB into the computer? Should give several options of what you want it as such as installer or media, deselect both? Not by a computer ATM so I'm unaware of the detailed options.
Sent from my SM-G900V using XDA Free mobile app
He's trying to find the function for attaching that says "Charge only" for attaching it via USB to computer/phone.
kprice8 said:
He's trying to find the function for attaching that says "Charge only" for attaching it via USB to computer/phone.
Click to expand...
Click to collapse
I know how useless charging from a computer is the real intention is to stop a random person from just hooking it up via usb and downloading all my files. When I connect I intend to use storage mounted to the host PC.
Deselecting does not work by the way either MTP or PTP has to be selected and if you try to uncheck it stays checked at least that is the behavior i am seeing.
Errant33 said:
I know how useless charging from a computer is the real intention is to stop a random person from just hooking it up via usb and downloading all my files. When I connect I intend to use storage mounted to the host PC.
Deselecting does not work by the way either MTP or PTP has to be selected and if you try to uncheck it stays checked at least that is the behavior i am seeing.
Click to expand...
Click to collapse
What was the last device you owned that allowed you to charge only? I don't remember my S4 having a charge only option, although I never feared someone would hook it up to a computer and steal files.
Sent from my SM-G900V using XDA Free mobile app
I will look into this when I return to my personal desktop. Work desktop has USB ports disabled. Apologies.
Dennisg34 said:
What was the last device you owned that allowed you to charge only? I don't remember my S4 having a charge only option, although I never feared someone would hook it up to a computer and steal files.
Sent from my SM-G900V using XDA Free mobile app
Click to expand...
Click to collapse
Cyanogenmod Modded Note II was not charge only, just had the ability to not auto select mount options from the storage menu you could simply uncheck both. Cant seem to do that with S5 stock rom.
Errant33 said:
Cyanogenmod Modded Note II was not charge only, just had the ability to not auto select mount options from the storage menu you could simply uncheck both. Cant seem to do that with S5 stock rom.
Click to expand...
Click to collapse
That was prob a CM ROM feature, stock S5 might not have this option.
Sent from my SM-G900V using XDA Free mobile app
Dennisg34 said:
That was prob a CM ROM feature, stock S5 might not have this option.
Sent from my SM-G900V using XDA Free mobile app
Click to expand...
Click to collapse
It may or may not but previous android versions allowed this behavior on stock roms. Took a bit of messing around but you could get it to stop auto-mounting, usually by enabling debug mode in developer options, that doesn't seem to be the case anymore .
Errant33 said:
It may or may not but previous android versions allowed this behavior on stock roms. Took a bit of messing around but you could get it to stop auto-mounting, usually by enabling debug mode in developer options, that doesn't seem to be the case anymore .
Click to expand...
Click to collapse
I think it may be the opposite, have you unchecked USB debugging and then plugged it into a computer? I know that sounds simple and stupid, but debugging mode is made to transfer files
Sent from my SM-G900V using XDA Free mobile app
Errant33 said:
In the past I could enable USB debug and my USB storage would not auto mount to the computer it was connected to. Now no mater what I try with the S5 it will not allow me to disable this automount behavior, even while on the lock screen. I find this to be a HUGE issue with security anyone who can grab my phone can access all the files on it very quickly.
Has anyone figured out how to disable this?
Sorry if this has been asked already, I did search.
Click to expand...
Click to collapse
If the screen is locked you should not be able to see phone or SD storage. Try this.
- Unplug the phone from the PC
- Lock the screen
- Plug phone back into PC
You should see the PC recognize the device, but when you click into it, it should be empty until you unlock the phone.
If you unlock the phone while plugged in. It will remember this until unplugged and locked again.
As far as I'm concerned turning the only real way is to set Windows to stop auto play for the device. However this would have to be done on any PC it's connected to.
Sharpie603 said:
If the screen is locked you should not be able to see phone or SD storage. Try this.
- Unplug the phone from the PC
- Lock the screen
- Plug phone back into PC
You should see the PC recognize the device, but when you click into it, it should be empty until you unlock the phone.
If you unlock the phone while plugged in. It will remember this until unplugged and locked again.
As far as I'm concerned turning the only real way is to set Windows to stop auto play for the device. However this would have to be done on any PC it's connected to.
Click to expand...
Click to collapse
And now I feel stupid, thank you for the help. I didn't even check to see if the drives were showing up once autoplay triggered and the device showed up in "Computer" I assumed the storage was available.
Dennisg34 said:
I think it may be the opposite, have you unchecked USB debugging and then plugged it into a computer? I know that sounds simple and stupid, but debugging mode is made to transfer files
Sent from my SM-G900V using XDA Free mobile app
Click to expand...
Click to collapse
Dennis, you are half right. USB debugging is meant for file transferring (but on a deeper level). It is more of a dev. tool then setting for the average user. When USB Debugging is enabled Devs. use it for establishing a connection Between the Android SDK(Software Development Kit) with an Android Based Device
Sharpie603 said:
Dennis, you are half right. USB debugging is meant for file transferring (but on a deeper level). It is more of a dev. tool then setting for the average user. When USB Debugging is enabled Devs. use it for establishing a connection Between the Android SDK(Software Development Kit) with an Android Based Device
Click to expand...
Click to collapse
Lol I knew that mike, I just didn't feel like typing all those details out so I just said transfer files
Sent from my SM-G900V using XDA Free mobile app
Hi. I have the same concern with my Android 7.
I used to own, years ago, and Android 2 device and once plugged in to a computer by USB, you needed to activate the data transfer manually on the screen, otherwise it was charge only.
I wish Android 7 would behave the same way. It is safer : you may charge your phone on any USB slot and use the phone at the same time without being worried that somebody could be downloading your files and installing a back door.
Is anyone else having an issue using Helium Backup to transfer data to their new phone? I'm using a Mac and when I connect the Nexus to my computer I get the green checkmark, but my phone hangs on the screen asking to put the phone in PTP mode, despite the phone already being in PTP mode.
I didn't have this problem when backing up data from my old Nexus 6.
gdeangel said:
Is anyone else having an issue using Helium Backup to transfer data to their new phone? I'm using a Mac and when I connect the Nexus to my computer I get the green checkmark, but my phone hangs on the screen asking to put the phone in PTP mode, despite the phone already being in PTP mode.
I didn't have this problem when backing up data from my old Nexus 6.
Click to expand...
Click to collapse
I am having the same issue. Any solution yet?
Me having the same issue as well...
And it's really bad, I was sure to be able to restore the backup from my MM Nexus 5... Both with Marshmallow, both with stock Android...
I contracted the Helium support but they didn't reply yet...
If someone find a solution or had news, please tell.
I just got my 6P and i'm having the exact same issue.
Did anyone succeeded in making it work on the new Nexus?
I have gotten this to work by setting starting the software on the phone and the PC and connecting the cable, then using the system settings to set the PTP mode. Sometimes it takes two or three tries.
so are there any other ideas on getting this to work? I'm running a Nexus 6P, I've tried connecting and switching to PTP mode, it verifies and says it's good to go, spends ~2 minutes performing Backup, then puts up the "Backup Error" screen.
I've made sure that my Desktop Password is blank, however when I try to run the backup it does complain about it since the device is encrypted, however it seems to auto-tab through and try to backup anyway.
I have set my encryption pin within the Helium Backup app as well, still can't get a backup to work.
same issue for me too
Nexus 6p - same problem. Usb debugging is activated, using PTP driver, Desktop app shows green check mark and good to go. Start the backup on the phone app and after about 2 minute pause - error backing up. Tried reloading the app, same issue. Not playing nice with Android 6 at all. Tried My Bakup (free version) and it worked fine.
Guess we'll have to wait for an updated Helium app.
Same problem. On my N6P I can't get Helium to activate using the Mac program. Helium on the phone asks me to switch to PTP, even if I'm already in PTP, and then Settings will crash when I tell it "yes" go to settings to do this.
Gotta have this fixed as Helium seems to be the only way to transfer my old T-Mobile VVM to my new phone. It worked from my N5 to my N6.
skesseks said:
I have gotten this to work by setting starting the software on the phone and the PC and connecting the cable, then using the system settings to set the PTP mode. Sometimes it takes two or three tries.
Click to expand...
Click to collapse
This worked perfect for me.
Launch Helium app on your phone but don't do anything else.
Launch Helium program on your computer.
Connect the cable to both.
And all worked ok after that.
It even backed up my T-Mobile Visual Voice Mail even though the author says it wouldn't.
I think i have another problem.. after it asks me to switch to PTP.. i tap OK.. then i get a message saying "settings has stopped working"!!
Then i do it all over again.. same result.
Just remove your lock screen security, after that everything will be working fine
I had the same issues as described until I tried the chrome app https://chrome.google.com/webstore/detail/helium-backup/gpglbgbpeobllokpmeagpoagjbfknanl?authuser=1 for some reason it made it recognize that it was connected
Under "Developer options" enable "USB debugging". After that again under "Developer options" there is another option called "Select USB Configuration". For this option select "Audio Source". That workaround just worked for me!
Abu-khulzat said:
Just remove your lock screen security, after that everything will be working fine
Click to expand...
Click to collapse
My god this has been bugging me for months and this fixed it! Thank you!
Abu-khulzat said:
Just remove your lock screen security, after that everything will be working fine
Click to expand...
Click to collapse
Nothing worked for me, i even got android N in hope it will be any different, it's the same. i get a message to enable PTP then
"settings has stopped working"
Any other suggestions!?
dcrandon said:
Same problem. On my N6P I can't get Helium to activate using the Mac program. Helium on the phone asks me to switch to PTP, even if I'm already in PTP, and then Settings will crash when I tell it "yes" go to settings to do this.
Gotta have this fixed as Helium seems to be the only way to transfer my old T-Mobile VVM to my new phone. It worked from my N5 to my N6.
Click to expand...
Click to collapse
Same issue here, Helium on the phone asks me to switch to PTP, even though I already did so, and then settings will crash when I hit yes to change to PTP. No bueno.
---------- Post added at 09:48 PM ---------- Previous post was at 09:36 PM ----------
tro11 said:
My god this has been bugging me for months and this fixed it! Thank you!
Click to expand...
Click to collapse
Removed security lock, didn't work at first, then after a reboot it connected correctly and I'm now restoring some of my apps and data (some of them stated in helium that they could not be backed up for some reason).
Thanks!!!
Another user stock on switch to PTP when the phone is on PTP
I just struggled with this for 30 minutes trying everything suggested above. Finally I clicked the settings in the Helium app and set a encryption pin via the helium settings. This solved it and it worked instantly. It would appear that because the Nexus 6P is encrypted by default Google won't let Helium backup with out also setting a password.
Got the same problem. Judging from the error stack, I would say the app needs an update for newer Android versions. It tries to open usb setting, but their location changed with recent versions so the app is crashing.
Hello, I've had the V20 for a number of months now and love the phone, but I never tested out a data connection before, only to find out that when I use both the LG cable and a Anker USB3.0 cable, my phone is not able to connect to any computer. The system prompt to select the MTP or PTP connection appears, but after making a selection and the computer seeing the phone for a split second, the connection is lost and the USB prompt appears rapidly over and over again. I even went into developer options and set MTP connection always.
I tried a reboot, battery pull and capacitor discharge, and a full system restore. No fix. The only work around I have now is a samba server or moving files with the SD card manually.
Please, if you have any ideas? Does not work in Windows and Linux.
Thank you.
Have you installed LG bridge?
Sent from my LG-H990 using Tapatalk
dbo989 said:
Hello, I've had the V20 for a number of months now and love the phone, but I never tested out a data connection before, only to find out that when I use both the LG cable and a Anker USB3.0 cable, my phone is not able to connect to any computer. The system prompt to select the MTP or PTP connection appears, but after making a selection and the computer seeing the phone for a split second, the connection is lost and the USB prompt appears rapidly over and over again. I even went into developer options and set MTP connection always.
I tried a reboot, battery pull and capacitor discharge, and a full system restore. No fix. The only work around I have now is a samba server or moving files with the SD card manually.
Please, if you have any ideas? Does not work in Windows and Linux.
Thank you.
Click to expand...
Click to collapse
Did you enable USB debugging in Developer options? If no, enable it.
Change the power settings in windows for the USB.
Power options
Advanced settings
Disable "USB selective suspend setting"
Tried all the above
Pierre118 said:
Did you enable USB debugging in Developer options? If no, enable it.
Click to expand...
Click to collapse
Yes, USB debugging works and I'm able to use ADB with my phone and both the Windows laptop and Linux Desktop. However, neither is able to reliably connect through the typical MTP and PTP methods. I finally got MTP to limitedly work with MTP when I use the LG supplied cable and ignore the USB connection prompt in Windows and Linux. I go straight to File Explorer and access the file directory of the phone. Every time I open a folder or access a file though, the phone rapidly pops up the USB connection message over and over while the file moves.
All third party cables and USB devices are not working other than just charging. In Linux, the error message in my logs is:
usbfs: process 20678 (mtp.so) did not claim interface 0 before use
reset high-speed USB device number 101 using xhci_hcd
dbo989 said:
Yes, USB debugging works and I'm able to use ADB with my phone and both the Windows laptop and Linux Desktop. However, neither is able to reliably connect through the typical MTP and PTP methods. I finally got MTP to limitedly work with MTP when I use the LG supplied cable and ignore the USB connection prompt in Windows and Linux. I go straight to File Explorer and access the file directory of the phone. Every time I open a folder or access a file though, the phone rapidly pops up the USB connection message over and over while the file moves.
All third party cables and USB devices are not working other than just charging. In Linux, the error message in my logs is:
usbfs: process 20678 (mtp.so) did not claim interface 0 before use
reset high-speed USB device number 101 using xhci_hcd
Click to expand...
Click to collapse
Is this behaviour on accessing and copying? You can not copy a file from your Windows laptop to the phone?
Yes, I cannot open folder directories, nor move files from phone to computer or visa versa.
Also. Try to not let the phone screen turn off. Change display time to 15 minutes or something.. Change back when finished. GL
kaluna00 said:
Also. Try to not let the phone screen turn off. Change display time to 15 minutes or something.. Change back when finished. GL
Click to expand...
Click to collapse
No change.
dbo989, did you resolve this issue? By any chance are you running avast mobile security? I was able to transfer files both ways via USB and had the pull down USB options without ever having to add USB debugging. Then I installed AVAST and USB has become charge only... none of the widely recommended solutions above will unlock USB. I see no apparent settings in AVAST so I will call them. If no resolution then I will trash Avast
bcapollo said:
dbo989, did you resolve this issue? By any chance are you running avast mobile security? I was able to transfer files both ways via USB and had the pull down USB options without ever having to add USB debugging. Then I installed AVAST and USB has become charge only... none of the widely recommended solutions above will unlock USB. I see no apparent settings in AVAST so I will call them. If no resolution then I will trash Avast
Click to expand...
Click to collapse
No, I never could resolve it. I ended up using Samba to fileshare with home computer, but lost any OTG cable ability. Never used antivirus or security software with my phone.
dbo989 said:
No, I never could resolve it. I ended up using Samba to fileshare with home computer, but lost any OTG cable ability. Never used antivirus or security software with my phone.
Click to expand...
Click to collapse
Just fixed it... turned out to be the port on my PC, I switched ports and its back as it was, no need to enable dev mode or USB debug... its still slow connection... I have to look up Samba solution, never used it.
Thanks for sharing
I just experienced the same problem with the USB connection constantly cycling between being plugged in and not. Windows kept alternating between the device connected and disconnected system sounds. I unplugged the USB 3.0 to USB-C cable on both ends, unkinked and straightened it, and plugged the cable back into the PC and the phone. Hasn't made another peep for the last half hour and the phone is staying in USB file transfer mode. I wiggled the cable at the phone end and still no further disconnections. Maybe I didn't connect the cable securely at the PC end the first time.
This is the first time this has happened since I started setting up the phone this week, so I don't know what to make of it. Regardless, I need to order some more USB-A to USB-C cables since this is my only one.
USB File Transfer Issue - Resolved
Hi, I had the exact same issue with the computer not seeing the phone as far as files. I was still able to use ADB, Fastboot, etc, so I figure it was not a hardware problem. Tried two different computers as well. Every time I selected "File Transfer" in the USB settings, the phone would beep, and when connected to the computer, the computer made the usual chime. The phone would not show up in explorer still.
Previously this phone had been rooted, but I wanted to bring it back to stock. I had flashed the latest KDZ file. Then using ADB and Fastboot locked the bootloader. It seems that the USB issue happened after that. Here is what finally fixed it:
Turned on developer options the usual way (tapping build number in software info) and then turned off "Allow OEM Unlock." Then I turned off developer options. Still, no luck, so I then re-flashed the latest KDZ (H91820h) again, but this time with the bootloader locked.
After everything was done, I set the phone up again, and now file transfer works perfectly.
I did not want to chance locking the bootloader while the phone was still rooted. I learned the hard way about that, and nearly bricked the phone once before. Luckily I still had factory upload saved in the LAF partition.
Hope this helps someone out there.
Turns out it was not fixed permanently
lighttech said:
Hi, I had the exact same issue with the computer not seeing the phone as far as files. I was still able to use ADB, Fastboot, etc, so I figure it was not a hardware problem. Tried two different computers as well. Every time I selected "File Transfer" in the USB settings, the phone would beep, and when connected to the computer, the computer made the usual chime. The phone would not show up in explorer still.
Previously this phone had been rooted, but I wanted to bring it back to stock. I had flashed the latest KDZ file. Then using ADB and Fastboot locked the bootloader. It seems that the USB issue happened after that. Here is what finally fixed it:
Turned on developer options the usual way (tapping build number in software info) and then turned off "Allow OEM Unlock." Then I turned off developer options. Still, no luck, so I then re-flashed the latest KDZ (H91820h) again, but this time with the bootloader locked.
After everything was done, I set the phone up again, and now file transfer works perfectly.
I did not want to chance locking the bootloader while the phone was still rooted. I learned the hard way about that, and nearly bricked the phone once before. Luckily I still had factory upload saved in the LAF partition.
Hope this helps someone out there.
Click to expand...
Click to collapse
After thinking it was in fact fixed, I rebooted the phone several times, turned off, then on, and all seemed well. Until the next morning. I turned it on, and the same issue happened again. No File Transfer mode to computer. ADB still worked. After being on for a while and getting warm, all of a sudden file transfer started working again. Rebooted, and turned on and off, and it continued to work. I figure its a bad part with a thermal issue somewhere so I put it in the freezer for 5 minutes. When booted up again, the same problem occurred until the phone warmed up. Weird? So I tried something completely different. I downgraded the phone to H91810p and tested again. It seemed to work fine. I put it in the freezer again, and the problem will not show itself. For whatever strange reason the problem appears to be heat related, and ONLY happens with the latest KDZ, Oreo 8.0 The only thing that I can theorize is that the SOC is bad, or there is a bad area of flash memory that is intermittent.
Does anyone have any clues? I am going to put it back in the freezer, go to work, and test again when I get home to confirm.
Craig
So i have the LG v20 H-990 (elsa) non rooted phone with Android 7.... Im trying to get it to connect to my pc but it wont work..i have usb drivers and lg drivers 4.2 plus i have lg bridge installed but as soon as i plug phone in...it just starts charging...
So in developer options i saw its set to mtp (media transfer protocol) and i cant cgange it even if i select sometging else it just goes back to mtp... So i tried turning usb debugging on...yet no joy....its not that the PC is not picking up the phone but more like tye phone is not letting connection ....well connect...please help?? I want to try and get some backups going and updates and also play with photos and vids ....please please please help
You have an H990 or an LS997? Also, the phone will charge, even on MTP(which is what it uses to communicate with PC), so you don't have to try to force stop it. Have you gone into device manager or ADB to verify your PC isn't reading the phone?
Sent from my LG-LS997 using Tapatalk
I have the h-990 and yes i have gone to device manager and there is nothing...
I've been having the same problem I couldn't change USB connection type from mtp to charging or ptp etc...what I found is if I try to change it from the developer menu it doesn't want to work, but if I bring down the notifications shade and expand the notification for it and change it with the popup it tends to work most times...I did have one time I couldn't get it to work at all until I factory reset my phone (wiped and reflashed ROM but I'm rooted and rom'd)... Sometimes restarting both phone and PC works...I'm not sure what it is it seems to be different on every PC I hookup to ...oh and sometimes I've toggled USB debugging off then on and that helped....so without several people having the problem and all trying to collect information about types of PC and cables and other individual variables I figured its some kind of glitch or some code error somewhere that under certain circumstances makes the v20 stupid, that likely won't be fixed or solved...this is just my experience , i thought maybe one of the things that seemed to help me might help you....good luck