Develop Bugs

[Q] connect desire z to ubuntu via usb

hey there,
i was searching the web and the forum though couldnt find any issues for connecting the desire z via usb to ubuntu (10.04 for me). however, it doesnt work with my DZ. i bought an addition micro-usb-connector (htc) and the phone does only charge and not ask, what kind of connection i want.
once, i read (and experienced) that you have to connect the usb to the back usb-ports (not the front ones) to get it working - that was with my desktop pc. now, using my laptop, the connection (mounting the sd, tethering or whatever) wont work on neither of the laptop's usb-ports...
so maybe there are two questions/issues:
does anyone have similar issues or maybe no problem with connecting the phone to
1) a laptop?
2) ubuntu 10.04?
thanks for your anwsers!

This might be nothing to do with it, but I found that I couldn't use adb with my phone when I was using a third-party USB cable, even though it sync'd (HTC Sync) fine. This was using XP. When I went back to the original HTC cable, adb worked fine.

Hi there,
I have a laptop with Ubuntu 10.04 (lucid) and everything works fine here. If i connect my DZ with my laptop a menu appears on the DZ asking if i want to charge only, use as disk drive, HTC sync, USB tethering and internet passthrough. I havent tried HTC sync but the rest works fine. I can even synchronize my music with Rythmbox or Banshee. So what i'm saying is that it should work out of the box.
My DZ is stock European edition, no root or s-off yet.
I suggest you first look in the settings of your DZ and look for "Connect to PC". There you should see the settings for the default connection and a "ask me" option. (My default is charge only and "ask me" is turned on). If this doesn't work maybe you can test your device on another computer to see if the menu does appear when you connect your phone.

Thanks for your replies.
steviewevie said:
This might be nothing to do with it, but I found that I couldn't use adb with my phone when I was using a third-party USB cable, even though it sync'd (HTC Sync) fine. This was using XP. When I went back to the original HTC cable, adb worked fine.
Click to expand...
Click to collapse
I was trying to get adb working but ended up in getting an no-permission-error. Couldn't figure out the problem...
mordecai83 said:
Hi there,
I have a laptop with Ubuntu 10.04 (lucid) and everything works fine here. If i connect my DZ with my laptop a menu appears on the DZ asking if i want to charge only, use as disk drive, HTC sync, USB tethering and internet passthrough. I havent tried HTC sync but the rest works fine. I can even synchronize my music with Rythmbox or Banshee. So what i'm saying is that it should work out of the box.
My DZ is stock European edition, no root or s-off yet.
I suggest you first look in the settings of your DZ and look for "Connect to PC". There you should see the settings for the default connection and a "ask me" option. (My default is charge only and "ask me" is turned on). If this doesn't work maybe you can test your device on another computer to see if the menu does appear when you connect your phone.
Click to expand...
Click to collapse
My DZ is also European,standard stock Rom,nothing done (yet). I checked the settings you mentioned and it says "ask me".
Next thing that is really weird: I can enable the tethering option (but cannot use it), yet the connection bypass (or what it is called in English) is greyed out. Tomorrow, I'm going to try the usb cable from the box...

ok, i checked with the original usb cable, still i wont get a connection. as my laptop sits on a docking station, i also tried the back-ports (at the docking station) and un-docked it - no success. none of the three ports will grant me access to the phone.
furthermore, i booted into windows xp and it will show a removable device, but i cannot access it (says something like "enter a device").
it seems to me, that it has something to do with my laptop (lenovo t61) and its usb ports... i have no idea, what to do, so i'm happy about any advice or experience...

Try the guide on adb at http://forum.xda-developers.com/showthread.php?t=865685 , it tells you where to get the Windows drivers.

thanks for the hint, i tried to adb on linux (without success), but going for the windows try...
i'm wondering about, why the phone does not simply give access to the sd-card, like any other removable device. why do i need to install htc sync (including the drivers)? when plugging any removable dev for the first time, it normally just installs the drivers and you'll get access... where is the problem here?

abprie said:
i'm wondering about, why the phone does not simply give access to the sd-card, like any other removable device. why do i need to install htc sync (including the drivers)? when plugging any removable dev for the first time, it normally just installs the drivers and you'll get access... where is the problem here?
Click to expand...
Click to collapse
I know what you mean, I would have thought it would "just work" if you connect the phone in "Disk Drive" mode, where the SD card is mounted on the PC.
You're not using a USB hub, right, you've tried connecting straight to your PC's USB ports ?

no, there is no usb-hub used. the connections i tried were always direct ones.

The next thing to do would be to try to connect your phone to another computer. Because it could also be a problem with your phone rather than your usb ports.

mordecai83 said:
The next thing to do would be to try to connect your phone to another computer. Because it could also be a problem with your phone rather than your usb ports.
Click to expand...
Click to collapse
well, the phone connects perfectly to my desktop-pc...

It's a long shot, but I did some Googling on "Lenovo T61 usb problem" and saw one report from a guy whose USB didn't work on his T61 with Ubuntu until he upgraded the BIOS

Steviewevie,you are doing my work,you know
Well thanks for the info,do you happen to have a link?
Edit:thinking about that... updating the BIOS??

abprie said:
Steviewevie,you are doing my work,you know
Well thanks for the info,do you happen to have a link?
Edit:thinking about that... updating the BIOS??
Click to expand...
Click to collapse
I only had a quick look, so a more extensive look may well turn up some useful info. The thread I stumbled across was at http://ubuntuforums.org/showthread.php?t=673501

Ok,i took a look at the link (thanks!), but that deals with ubuntu 7.04. To me, it doesn't seem to be the issue that usb ports are not working, as other usb sticks and my touch pro 2 were recognized without any problems.
Imho,it is like when I connect to the front ports of my desktop, when the connection doesn't work either, so I'll have to live with it. Thanks for your support anyway (I'm still open for new approaches)
BTW: it really bugs me that I can't just plug that device and use it as a mass storage like any other...

i have absolutely no idea why, but now it works... today, when i was charging the phone via usb (the thing, that was working from the beginning), my DZ rebooted spontaneously and afterwards it just showed the missed connection options...
no i just need to figure out how to use the internet-forwarding (dont know the correct translation - what i want is to use the internet from my pc on the phone) ... any clues?

USB Drivers for Epic 4G Touch

Does anyone have a link for the drivers for the Epic 4G Touch? My phone is not showing up on adb and I can't seem to find them.

they should be the same one as the epic no?

http://www.samsung.com/us/support/downloads/SPH-D710ZKASPR
Should be there when they're released ... all that shows up right now is the user manual.

imtjnotu said:
they should be the same one as the epic no?
Click to expand...
Click to collapse
I don't think so.

what drivers are you refering to? are you trying to access your USB storage inside the phone on your computer or what are you trying to do? which USB drivers are you refering to?

Connect to the computer with usb debugging disabled. It will install a driver, then unplug, enable usb debugging, and you should be able to see it with adb
Sent from my SPH-D710 using xda premium

SAShady said:
Connect to the computer with usb debugging disabled. It will install a driver, then unplug, enable usb debugging, and you should be able to see it with adb
Sent from my SPH-D710 using xda premium
Click to expand...
Click to collapse
It installed some drivers when debug was disabled but now it is enabled and it still doesn't show in adb devices
---------- Post added at 02:36 PM ---------- Previous post was at 02:35 PM ----------
©ertifiedMuffDiver™ said:
what drivers are you refering to? are you trying to access your USB storage inside the phone on your computer or what are you trying to do? which USB drivers are you refering to?
Click to expand...
Click to collapse
I want to be able to connect via ADB. I have Win7 64 bit and can't find a driver for my phone.

PhantomPhreak53 said:
It installed some drivers when debug was disabled but now it is enabled and it still doesn't show in adb devices
---------- Post added at 02:36 PM ---------- Previous post was at 02:35 PM ----------
I want to be able to connect via ADB. I have Win7 64 bit and can't find a driver for my phone.
Click to expand...
Click to collapse
Same deal, works fine in linux though

SAShady said:
Connect to the computer with usb debugging disabled. It will install a driver, then unplug, enable usb debugging, and you should be able to see it with adb
Click to expand...
Click to collapse
I installed the USB drivers from Samsung before I connected the USB.
This method does not work.
My computer does not see my device at all, though it is charging.
it doesn't mount with debugging on or off
WTF!
Ideas?
Windows 7 32-bit

Have you tried installing Kies? It delivers E4GT drivers during installation.
Here:http://api.viglink.com/api/click?format=go&drKey=1359&loc=http%3A%2F%2Fforum.xda-developers.com%2Fshowthread.php%3Ft%3D1267762%26page%3D3&v=1&libid=1316391418667&out=http%3A%2F%2Fapi.viglink.com%2Fapi%2Fclick%3Fformat%3Dgo%26drKey%3D1359%26loc%3Dhttp%253A%252F%252Fforum.xda-developers.com%252Fshowthread.php%253Ft%253D1266777%2526highlight%253Dkies%26v%3D1%26libid%3D1316390245606%26out%3Dhttp%253A%252F%252Forg.downloadcenter.samsung.com%252Fdownloadfile%252FContentsFile.aspx%253FCDSite%253DUNI_CA%2526CDCttType%253DSW%2526ModelType%253DN%2526ModelName%253DFM_UPDATE%2526idyn%253DN%2526VPath%253DSW%252F201105%252F20110512115717796%252FKies_2.0.2.11071_128.exe%26ref%3Dhttp%253A%252F%252Fforum.xda-developers.com%252Fsearch.php%253Fsearchid%253D91086814%26title%3DKIES%2520and%252032%2520%2526%252064%2520bit%2520Drivers%2520for%2520Epic%25204G%2520Touch%2520-%2520xda-developers%26txt%3Dhttp%253A%252F%252Forg.downloadcenter.samsung.co....11071_128.exe%26jsonp%3Dvglnk_jsonp_13163902411401&ref=http%3A%2F%2Fforum.xda-developers.com%2Fforumdisplay.php%3Ff%3D1284&title=%5BACS%5D%20Pre-rooted%20kernel%20-%20Page%203%20-%20xda-developers&txt=http%3A%2F%2Fapi.viglink.com%2Fapi%2Fclick%3Ffor...13163902411401&jsonp=vglnk_jsonp_13163916581211

iSaint said:
http://www.samsung.com/us/support/downloads/SPH-D710ZKASPR
Should be there when they're released ... all that shows up right now is the user manual.
Click to expand...
Click to collapse
I just checked the link. Looks like they have the drivers available now. Although I do suggest the above with Kies installation.

!!FIXED!!
Kn0wBuddy said:
Have you tried installing Kies? It delivers E4GT drivers during installation.
Click to expand...
Click to collapse
I did actually, and Kies couldn't see the phone.
Also, the phone did not see a USB connection, though it was charging
per the documentation I tried to mount as mass storage device through Wireless and Networking. This didn't do anything either, phone still charges.
I had borrowed the USB cable from a co-worker, I had him plug it in to his phone, and it works just fine, just XP machine sees his phone.
Turns out, its something with the cable.
rummaging around for another cable, I noticed I had my XOOM and its cord with me. Its the same type, but its the Moto brand one (if that makes it any different?)
plugged it in instead just for ****s and giggles. It works.
Phone just doesn't like his cable for whatever reason.
Now Win7 sees the phone, and Kies sees it (doesn't like the debugging mode but whatever)
His cable was an LG branded one. Any one know if there's something different?

I've tested 2 LG branded usb cables and they do not work. Same thing you described.
I found it in pull it out half way the phone recognizes USB and the computer sees the phone but if I try to transfer files I get a "device disconnected" error... Or something like that. I can see the files, just can't touch 'em.
I could not believe that the cable is have been using on tons of devices for years wouldn't work only on this one. I'd sooner believe it was the computer. So I grabbed a coworkers much newer LG branded cable and same thing... I still didn't believe it after testing 2 cables on 3 computers... Though I had a hunch from the first second I plugged it in I still can't believe it... And then I read this.
Explanation please, lol.
Sent from my SPH-D710 using XDA App

I downloaded Kies as well, and it did install a driver called "SAMSUNG Mobile USB Composite Device", but I don't think this is what I need (trying to root).
Whenever I open Odin w/ the phone connected, no COM port mapping number displays...
Using the USB cable that came w/ the phone.

Deleted original post.
Just go to this forum and download the USB Android Drivers from 1) Prerequisites of the Rooting process.
http://forum.xda-developers.com/showthread.php?t=1342728
FYI - I had to use the provided Samsung USB charger cable for my computer and phone to communicate. Otherwise, my phone would only charge, but it would not show up as MTP-Connected (or USB Connected).

KYT said:
I installed the USB drivers from Samsung before I connected the USB.
This method does not work.
My computer does not see my device at all, though it is charging.
it doesn't mount with debugging on or off
WTF!
Ideas?
Windows 7 32-bit
Click to expand...
Click to collapse
My exact problem and I started a thread yesterday about it --- some people have suggested some things to try, none of them worked for my case but check here and try some of this stuff
--- http://forum.xda-developers.com/showthread.php?t=1435271 ---
Like I said my issue is still occuring, I'm heading to Sprint tomorrow for a replacement

AVAH0LIC said:
My exact problem and I started a thread yesterday about it --- some people have suggested some things to try, none of them worked for my case but check here and try some of this stuff
--- http://forum.xda-developers.com/showthread.php?t=1435271 ---
Like I said my issue is still occuring, I'm heading to Sprint tomorrow for a replacement
Click to expand...
Click to collapse
Have you considered getting your USB adapter/port checked for issues? It could be possible that the adapter no longer has the ability to send data, but only charges the E4GT when connected; try using another USB port on your computer.

taufunc said:
Have you considered getting your USB adapter/port checked for issues? It could be possible that the adapter no longer has the ability to send data, but only charges the E4GT when connected; try using another USB port on your computer.
Click to expand...
Click to collapse
Tried all ports --- updated all drivers... even formatted my computer... its definitely the phone.
I have three computers here and none of them are working with it --- and the weirdest thing that I just noticed === it seems like its just showing the charging animation... I left it plugged into my computer when it was supposedly charging, screen turned off, check back in 20 minutes and it had gone down by 20% --- it's just like its triggering the charging animation

If your phone will charge but won't transfer data, there is a strong possibility it is actually a problem with the cable. I tested 3 LG micro-usb cables which all worked fine with an LG phone, but would not transfer data with the Epic 4G Touch. The would only charge. I thought my USB port was busted at first also because I tried 3 different cables and this is the first time I've encountered a situation where micro-usb cables were not universal.

sfhub said:
If your phone will charge but won't transfer data, there is a strong possibility it is actually a problem with the cable. I tested 3 LG micro-usb cables which all worked fine with an LG phone, but would not transfer data with the Epic 4G Touch. The would only charge. I thought my USB port was busted at first also because I tried 3 different cables and this is the first time I've encountered a situation where micro-usb cables were not universal.
Click to expand...
Click to collapse
Thats strange because that is all I've used were LG cables... they have worked fine for me since day one?

Phone isn't recognised by computer nor is my USB C stick

Hello,
I hope someone can help. I am trying to get my computer to recognise my phone. I am not rooted and I have Marshmellow 6.0.1
I unlocked developer options. I bought a cable and it worked! The computer saw my phone. However it stopped seeing my phone. Why I don't know! But when it did work I saw the driver was not for the 5x but from my S4. Well since it's not working I ordered the recommended USB cables by Benson Leung Tech Matte. Still unable to see my phone. Tried cables on another computer with same results. The computer I tried it on recognised my phone and then it also stopped seeing my phone.
I also bought a usb c stick to use on my phone. My phone responds to the stick but when I choose for MTP from charging nothing happens and i cannot access the USB Stick. In Dev options MTP is selected. I also noticed that USB tethering is not available. I have no clue what to try next.

packtack1 said:
Hello,
I hope someone can help. I am trying to get my computer to recognise my phone. I am not rooted and I have Marshmellow 6.0.1
I unlocked developer options. I bought a cable and it worked! The computer saw my phone. However it stopped seeing my phone. Why I don't know! But when it did work I saw the driver was not for the 5x but from my S4. Well since it's not working I ordered the recommended USB cables by Benson Leung Tech Matte. Still unable to see my phone. Tried cables on another computer with same results. The computer I tried it on recognised my phone and then it also stopped seeing my phone.
I also bought a usb c stick to use on my phone. My phone responds to the stick but when I choose for MTP from charging nothing happens and i cannot access the USB Stick. In Dev options MTP is selected. I also noticed that USB tethering is not available. I have no clue what to try next.
Click to expand...
Click to collapse
USB debugging needs to be selected. Also, you need to toggle to PTP and back to MTP
Install correct drivers onto your pc
https://userscloud.com/niz9jnon5ooz
Or
https://www.androidfilehost.com/?fid=24052804347829096

Tulsadiver said:
USB debugging needs to be selected. Also, you need to toggle to PTP and back to MTP
Install correct drivers onto your pc
https://userscloud.com/niz9jnon5ooz
Or
https://www.androidfilehost.com/?fid=24052804347829096
Click to expand...
Click to collapse
Thanks for the drivers. USB Debugging is on. When I toggled Charging popped up instead of PTP and so I kept toggling and it finally went to PTP and so I toggled MTP and it goes back to charging! So I kept at it until it finally went to MTP. Is this normal? I counted 12 tries before changing from charging to PTP! But the computer doesn't see the phone. I did it a few times

packtack1 said:
I also bought a usb c stick to use on my phone. My phone responds to the stick but when I choose for MTP from charging nothing happens and i cannot access the USB Stick. In Dev options MTP is selected. I also noticed that USB tethering is not available. I have no clue what to try next.
Click to expand...
Click to collapse
i honestly never thought about this, is this even supposed to work without some kind of an OTG adapter. i mean sure, the plugs fit, put do the pins match/work for that configuration?
from how you describe that your phone reacts i would guess it doesn't, and it sounds more like your phone goes into client, as opposed to host mode.
very interested to see what someone with more knowledge of the matter would have to say about plugging a usb-c memory stick directly into your phone.

Broken303 said:
i honestly never thought about this, is this even supposed to work without some kind of an OTG adapter. i mean sure, the plugs fit, put do the pins match/work for that configuration?
from how you describe that your phone reacts i would guess it doesn't, and it sounds more like your phone goes into client, as opposed to host mode.
very interested to see what someone with more knowledge of the matter would have to say about plugging a usb-c memory stick directly into your phone.
Click to expand...
Click to collapse
I can read/write to a sandisk USB memory stick using the proper adapter and using USB OTG file manager for Nexus from the play store.
---------- Post added at 05:53 PM ---------- Previous post was at 05:45 PM ----------
packtack1 said:
Thanks for the drivers. USB Debugging is on. When I toggled Charging popped up instead of PTP and so I kept toggling and it finally went to PTP and so I toggled MTP and it goes back to charging! So I kept at it until it finally went to MTP. Is this normal? I counted 12 tries before changing from charging to PTP! But the computer doesn't see the phone. I did it a few times
Click to expand...
Click to collapse
I've used several phones on my PC and at first it had a little trouble but finally settled in. Kind of like a new ROM. You have to give it a while to settle in and get its groove on.

Tulsadiver said:
I can read/write to a sandisk USB memory stick using the proper adapter and using USB OTG file manager for Nexus from the play store.
Click to expand...
Click to collapse
not really a surprise there, but what OP described was putting a usb-C stick directly into the phone, without any cables or adapters in between, with the question emerging if that is even supposed to work (which in his case didn't) due to possible problems of the pin-layout, etc.
Tulsadiver said:
I've used several phones on my PC and at first it had a little trouble but finally settled in. Kind of like a new ROM. You have to give it a while to settle in and get its groove on.
Click to expand...
Click to collapse
that does not explain his PC suddenly not recognizing his phone anymore though.
at this point it sounds to me like either there still is a driver issue (e.g. the mentioned S4 driver wan't properly uninstalled), or one of the usb ports (phone or pc) has an issue.
try different ports on your PC and make sure other devices work with the ports. if not try if you can get it to work by applying a little pressure in different directions to the cable and listen out for windows' annoying usb sound.
on the other end make sure your phone really is connected correctly to the cable. it should snap in just like the OEM charging cable which took some time getting used to to overcome the resistence of the usb-c port.

Tulsadiver said:
I can read/write to a sandisk USB memory stick using the proper adapter and using USB OTG file manager for Nexus from the play store.
---------- Post added at 05:53 PM ---------- Previous post was at 05:45 PM ----------
I've used several phones on my PC and at first it had a little trouble but finally settled in. Kind of like a new ROM. You have to give it a while to settle in and get its groove on.
Click to expand...
Click to collapse
Thanks again for your quick reply,
I tried my Samsung Tab II tablet and my old S4 on my PC and they both work as advertised. Recognised right away and I hadn't used my tablet to my PC before. What I think is maybe its the USB on the phone itself?

Broken303 said:
not really a surprise there, but what OP described was putting a usb-C stick directly into the phone, without any cables or adapters in between, with the question emerging if that is even supposed to work (which in his case didn't) due to possible problems of the pin-layout, etc.
that does not explain his PC suddenly not recognizing his phone anymore though.
at this point it sounds to me like either there still is a driver issue (e.g. the mentioned S4 driver wan't properly uninstalled), or one of the usb ports (phone or pc) has an issue.
try different ports on your PC and make sure other devices work with the ports. if not try if you can get it to work by applying a little pressure in different directions to the cable and listen out for windows' annoying usb sound.
on the other end make sure your phone really is connected correctly to the cable. it should snap in just like the OEM charging cable which took some time getting used to to overcome the resistence of the usb-c port.
Click to expand...
Click to collapse
I think its the phone itself, since it did work briefly. Also with the USB C thumb drive the phone recognises it but will not read the thumb drive. I ordered it from play store I wonder how getting it repaired/looked at is going work Have to wait until Monday to call!

Hello again,
I Hope you guys like some feedback about my issue. Contacted Google and they asked me just about all the same questions and had me do some screen shots and try some of their ideas such as factory reset, trying other computers and other cables. Nothing worked so they sent me a new phone! Just got it yesterday. Would have been here sooner but I was busy!
So got new phone setup and the computer recognizes my phone on PTP but not MTP. Also my driver for the phone is a generic nexus and the it still shows up as a samsung! How can I get the new driver if when i do a search for new driver my computer says I have the best driver already installed? I don't want the driver to still be a problem. So i hope you guys have some answers. Lol! I know you guys do!!

packtack1 said:
Hello again,
I Hope you guys like some feedback about my issue. Contacted Google and they asked me just about all the same questions and had me do some screen shots and try some of their ideas such as factory reset, trying other computers and other cables. Nothing worked so they sent me a new phone! Just got it yesterday. Would have been here sooner but I was busy!
So got new phone setup and the computer recognizes my phone on PTP but not MTP. Also my driver for the phone is a generic nexus and the it still shows up as a samsung! How can I get the new driver if when i do a search for new driver my computer says I have the best driver already installed? I don't want the driver to still be a problem. So i hope you guys have some answers. Lol! I know you guys do!!
Click to expand...
Click to collapse
If you had a samsung phone before you need to uninstall all the samsung drivers then install the proper nexus drivers

I was a little worried about uninstalling the driver but it worked!! Thanks! Now i can root it!!
metpage said:
If you had a samsung phone before you need to uninstall all the samsung drivers then install the proper nexus drivers
Click to expand...
Click to collapse

HTC M9 Connecting to Computer Problem

Hey Guys,
First of all, I am a new member here my name is Salem and its an amazing forum.
Anyway, I have a slight problem with my HTC M9 while connecting it into my laptop. First, when I connect it, the mobile starts charging, and it gives me no option as to change it to Media Transfer or anything... even it gives me "Slow Charging" Error, and my laptop is detecting nothing, as if nothing happened, nor its searching for any drivers...
I went to developer menu and used USB Debugging, and selected USB configuration as MTP, and it didn't work...
I installed HTC Sync to get the drivers, and it is the same.
Can you guys help me? because I wanna root the phone and I tried various Auto Root applications without using the PC and they didn't work. Thank you guys

No signal from the laptop probably means you have a faulty USB cable. Most likely a break in one of the data wires.
Try another good quality usb 2.0 cable.
Beamed in by telepathy.

Same issue. Tried multiple cables
I have the same issue. When I try to plug into any PC a slow charging message pops up but the phone won't give me the option to connect to PC. I have turned on USB Debugging and selected MTP (Media Transfer Protocol). Please help!
I am with TPG. Android 6.0 HTS 7.0 Software number 3.35.617.12
I only bought this phone a week ago and it updated when I turned it on.

jaystarrs said:
I have the same issue. When I try to plug into any PC a slow charging message pops up but the phone won't give me the option to connect to PC. I have turned on USB Debugging and selected MTP (Media Transfer Protocol). Please help!
I am with TPG. Android 6.0 HTS 7.0 Software number 3.35.617.12
I only bought this phone a week ago and it updated when I turned it on.
Click to expand...
Click to collapse
Most likely a crap or broken cable. Other cables, other sockets, other pc's are all worth a try.
You should leave the usb port in "charging only". When you successfully connect to a pc the phone will prompt you to allow data transfers to that computer.
I know this because mine does it. I'm sick to death of the effing thing promting me to connect to my xbox one when all i want to do is charge the effing thing... My phone is set to charging only.
I suppose rom choice will affect it too. Mine is rooted stock 6.0.
Beamed in by telepathy.

Still have same problem
I still can't connect my M9 to my PC. Still have slow charge message come up and no option to connect to PC. My work around has been transferring files using WiFi. However, now I need to do a presentation using scrcpy and will probably have to get a new phone. I'm tmepted not to buy HTC again. Pretty frustrating and no fix found on the internet...

USB Connection problem

Hello!
I really hope someone can help me out on this.
I have just bought a Lenovo P2a42 and everything works fine, except that I cannot connect it to my computer via USB cable.
I tried different known working cables on different known working machines (win 7 & 10) with no success.
It looks like the phone stuck at "charge only" USB mode, the PC does not even react when phone is connected, only on the phone I can see it is charging.
So it is not a driver issue, as it looks like the PC does not even know about a phone is connected.
I tried to change USB Connection mode under Developer options, and nothing happened. However, it was strange, that if I change the USB mode from "Charge only" to MTP, after selection made, the text label under this option in the Developer options remained "charge only", and only if I go back and forth one level (to settings menu and then back to developers menu) it shows the MTP setting I have set earlier.
It is weird, but for me it looks like as the phone stuck at charge only mode, and I cannot switch between USB connection modes.
There is no notification at all about USB if I connect the cable.
I have made a factory reset on the phone, and nothing changed.
My P2 is running android 7.0.
Do you guys have any idea? I'm really desperate on this.
Thanks in advance for any tip!
Moire76

I seem to have this problem also because of the above i am unable to get adb working properly although drivers are setup.
I fixed it now by using the PDAnet program which found and installed some android drivers after which the phone is recognised properly as Lenovo p2 and is picked up in adb as attached device.

moire76 said:
Hello!
I really hope someone can help me out on this.
I have just bought a Lenovo P2a42 and everything works fine, except that I cannot connect it to my computer via USB cable.
I tried different known working cables on different known working machines (win 7 & 10) with no success.
It looks like the phone stuck at "charge only" USB mode, the PC does not even react when phone is connected, only on the phone I can see it is charging.
So it is not a driver issue, as it looks like the PC does not even know about a phone is connected.
I tried to change USB Connection mode under Developer options, and nothing happened. However, it was strange, that if I change the USB mode from "Charge only" to MTP, after selection made, the text label under this option in the Developer options remained "charge only", and only if I go back and forth one level (to settings menu and then back to developers menu) it shows the MTP setting I have set earlier.
It is weird, but for me it looks like as the phone stuck at charge only mode, and I cannot switch between USB connection modes.
There is no notification at all about USB if I connect the cable.
I have made a factory reset on the phone, and nothing changed.
My P2 is running android 7.0.
Do you guys have any idea? I'm really desperate on this.
Thanks in advance for any tip!
Moire76
Click to expand...
Click to collapse
I think it's because you must install to your PC mtp drivers.

Thanks for your answer, but unfortunately, no. As I mentioned, there is no communication between phone and PC.
With a missing driver, you can see your unknown USB device in device manager.
BTW, since then I have returned the phone to seller, and they confirmed, that the USB port of the phone is faulty (data pin connection to phone motherboard is faulty)
They are now working on the repair and will be done by tomorrow.
chtsarts said:
I think it's because you must install to your PC mtp drivers.
Click to expand...
Click to collapse

Finally I contacted seller and send it back for repair.
They confirmed that one leg of the USB motherboard connector was detached from the board.
They replaced the connector, and now it's just working as it should.
Have a nice day!
Moire76