Database Users

Fix for adb not working because phone is stuck in "modem" mode

Just ran into a problem which took me some time to solve. Thought I would share it to save other people some frustration.
After an adb reboot the i5800 got stuck in "modem" mode. i.e. android booted fine but gave a modem and a serial port over usb rather than adb. Reboots did not solve the problem.
The solution is to enter recovery screen:
reboot recovery
OR
press proper buttons to get into recovery mode
And then perform a reboot from there

Is this the same as *#7284# and selecting "PDA" on UART and USB, or just on USB? Or is this a completely separate thing?

miki.antena said:
Is this the same as *#7284# and selecting "PDA" on UART and USB, or just on USB? Or is this a completely separate thing?
Click to expand...
Click to collapse
Thanks so much for this!!!! After helping hack a friends build.prop to enable Apparatus compatibility in the Market, I found USB wasn't working properly anymore. Resetting changes in the phone didn't help (I had to do this via the phone terminal) although I at least managed to buy Apparatus before the sale ended.
After initially getting confused due to a lack of drivers and the occasional 'nH' showing up devices without drivers which made me think something was borked, I worked out from the VID & PID it was just the lack of drivers making (well I'm not sure why it did the 'nH' sometimes it got serial something instead), once I installed the drivers all was fine.
Except still mass storage wasn't showing and the Samsung connect manager didn't show up on my phone when I connected USB, nor did ADB work at all. In fact, it didn't even show up in the phone menu as debugging mode if I didn't start phone with it connected (or something like that). Funnily enough when I did get it the debugging to show up I did get the USB mass storage to show up in the phone, but it didn't help (it just unmounted the card which I think is all it ever does).
Anyway after a bit more fooling around I eventuall came across http://forum.xda-developers.com/showthread.php?t=1215103 and the stuff about modem and mkasick's post which sounded a lot like it could be my problem. The code for that Samsung phone didn't work so I searched for the 5800 and came across this giving me the right code. Sure enough UART (but not USB) was set to modem instead of PDA. I was unsure whether that was wrong but changed it anyway and yep that fixed it!
I still have no idea what went wrong. I had thought may be the phone didn't like me rebooting via ADB but I've now done that several times. In fact most of the stuff except install a superuser update has been more or less repeated. I guess it was just some strange rare occurence that it somehow got changed. I did have to reconnect the USB while working the first time, not sure why but ADB lost connection then I found couldn't connect. Perhaps that's somehow related. Now that I know what to do, it's trivial but very annoying when I didn't. I still don't get why Samsung decided to make the connect manager (my phone doesn't have that) only to have some hidden option where it can be set to modem or USB.
Partially because of this, I never got to get Tilestorm HD become compatible in time for the sale although my friend wasn't so interested in that. (Eventually I worked out using the THC Tattoo modded market which reports a fake resolution enables it. Well, I also modified the build.prop but I don't know if that was necessary. I wasn't able to do it solely by the build.prop. But it was way too late by then to buy Tilestorm HD cheap.)

Nil Einne said:
I still have no idea what went wrong. I had thought may be the phone didn't like me rebooting via ADB but I've now done that several times.
Click to expand...
Click to collapse
This may sound like crazy idea, but is your USB port/connector clean?
(The USB port allows for dozens of different phone functions when using very specific resistance between data pins.)

i bought a LG D802 32gb last night as i was using a 16 gb before i wanted to flash cloudy g3.. so i tried to install custome recovery twrp...
now i am in fast boot mode..
it says :
[880]fastboot mode started
[910]udc_start()
when i attach usb cable
[1100]-reset-
[1110]-portchange-
[1120]-reset-
[1130]-portchange-
[1140]-fastboot: processing commands
i tried holding volume + and and attaching the usb cable but no luck ... so now i have NO RECOVERY, NO DOWNLOAD MODE, AND MY WINDOWS PICKING UP MY PHONE AS "USB MODEM PHONE ADB PORT"
please help

Rooted Evo will not connect to PC

I rooted my Evo with unrevoked3 a few months ago and since then (or sometime after) my phone will not connect to my PC. It will charge but that's it. I checked off the ask me every time I connect option, it's set to mount as disk drive. I am using the stock usb cable that came with the phone. I tried hard resetting, data wiping back to factory default. Still won't connect. Tried reinstalling HTC Sync. Doesn't recognize my phone being plugged in. I want to flash my phone back to stock so I can bring it back to Sprint but I can't bring it back rooted and I can't unroot it without using the PC. I have Googled and Googled all over but can't find an answer. I did a search here and there are similar problems but no solutions that have worked for me. Could it be the cable? It is in good condition as is the phone. Maybe the USB port on the phone? Those went bad on all my Blackberries. I'm sure this problem is expressed frequently but a response would make my day.

roblacroix said:
I rooted my Evo with unrevoked3 a few months ago and since then (or sometime after) my phone will not connect to my PC. It will charge but that's it. I checked off the ask me every time I connect option, it's set to mount as disk drive. I am using the stock usb cable that came with the phone. I tried hard resetting, data wiping back to factory default. Still won't connect. Tried reinstalling HTC Sync. Doesn't recognize my phone being plugged in. I want to flash my phone back to stock so I can bring it back to Sprint but I can't bring it back rooted and I can't unroot it without using the PC. I have Googled and Googled all over but can't find an answer. I did a search here and there are similar problems but no solutions that have worked for me. Could it be the cable? It is in good condition as is the phone. Maybe the USB port on the phone? Those went bad on all my Blackberries. I'm sure this problem is expressed frequently but a response would make my day.
Click to expand...
Click to collapse
I am assuming you have a windows based PC.
Do you have any device driver conflicts in your windows Device Manager? I'd start there. Your computer wouldn't properly reconize your phone if you have some sort of conflict or you don't even have the right drivers installed.

Broken usb is a known issue with EVO, something about how it is soldered onto the motherboard. Are you running a custom ROM or kernel?
Have you tried mounting it in Recovery? You can always use a MicroSD card adapter to transfer files. I just use Dropbox.
You can unroot without your PC. Just download everything on your phone.
Download the S-On tool from Unrevoked. Flash it in Recovery. Check to make sure phone is S-On
Download the PC36IMG.zip restore to your phone, there is a thread with it in Development. Use Astro/Root Explorer to move the PC36ING.zip to the base of your SD card.
Go into HBoot and it will recognize it. It'll ask if you want to update, say yes. Let it sit and do its thing.
There is a guide in q&a about unrooting
Sent from my PC36100 using XDA Premium App

Yes, Windows based PC.
So I downloaded the S-On tool, moved it to the root of my card with Super Manager, then flashed it. Says S-On at boot. I rebooted my phone, moved the PC136zip to the root of the sd card. Rebooted with down vol + power and it checks for pc136zip but doesn't ask anything. I tried zipping it in recovery and it says bad. I tried another download site and did the same thing, doesn't recognize it upon hboot, so I tried zipping from sdcard, selected it, it quickly said some text about updating then nothingness. How do I know if it unrooted?
Edit: Also, I checked my device manager on my pc but it didn't show anything wrong.

Install terminal and type su
You will get permission denied if not rooted.
I have a working PC36IMG.zip in my Dropbox, if you need it tell me and I'll PM you a link

if u think ur phone is broke cuz u cant connect to pc after u rooted it, it isnt broke at all. my phone did the same thing after i rooted it. I don't remember exactly cuz it was a while ago, but u may have to turn on usb debugging in settings before it will recognize it. also u can go into recovery and mount usb to write to it

It might have to do with the drivers you have to install when you run unrevoked. It has been a while, but I am pretty sure I had to install a special USB driver to run unrevoked.
Sent from my PC36100 using XDA Premium App

I had this happen to my phone last week after I used my computer to root two other peoples phones.
It makes no sense really, but while in recovery I connected to the computer to move a few files to the phone, and after that it was able to connect whether in recovery or not.
See if your phone can make the connection while in recovery.

Ok, so I brought the phone to Sprint after trying a different USB cord and they said the port is damaged. My new phone arrived today but I need to get my phone back to stock ASAP. I got it back to S-On but when I attempt the pc36img flash it says...
SD Checking....
Loading... [PC36DIAG.zip]
No image!
Loading... [PC36DIAG.nbh]
No image or wrong image!
Loading... [PC36IMG.zip]
Then the black bar loads.
Then it says.
Main Version is older!
Update Fail!
Do you want to reboot device?
I hit yes.
I still have SuperUser Permissions.
I've downloaded a few different pc36img.zip from different pages and this happens every time.
Edit: Probably wondering how I did this without a USB. I bought an SD Card reader and transferred everything through PC.

Try this.
1. Plug your usb cable into the computer.
2. Plug your usb cable into the phone.
3. Wait and listen for the little sound that tells you that the computer sees it.
4. Unplug your USB cable from the phone and wait about 2 seconds.
5. Plug the USB cable back into the phone, listen for the sound, then look at the computer monitor.
On mine, I have to do this to make the autorun window pop up running Windows Vista.
Shot in the dark, but thought it might help.

Noise doesn't happen. USB port is damaged, noise will never happen.
On the upside,
(I don't have 8 posts yet or I would show the download image) Updated version of PC36IMG.ZIP that worked. Just rename to pc36img and it unrooted my phone.

I'm having this same problem. Now, In this case, I hear the noise. Then a second double noise (like when you unplug the usb) This happens whether I am in recovery or not. Also, oddly enough, the thing works on my mac. It's done this through several different ROMS Right now I'm using synergy (which is great btw). I'm really at a loss here. Anyone got any other ideas? Like where I can find it in device manager. There are like 9 "root usb" devices
*edit* Also, I'm using window's XP proffessional. I've tried some trouble shooting but nothing is really working. Also it's being assigned a disk letter when connected, during the short time (like less than a second) when the disk pops up it says removable disk. I timed it and it's being assigned H, but it's being ejected almost immediately.

I think it has something to do with power being supplied in the cord. Maybe something to do with kernal? I dunno. But I plugged it into a usb port in the back of my pc, and it read it : /

roblacroix said:
I rooted my Evo with unrevoked3 a few months ago and since then (or sometime after) my phone will not connect to my PC. It will charge but that's it. I checked off the ask me every time I connect option, it's set to mount as disk drive. I am using the stock usb cable that came with the phone. I tried hard resetting, data wiping back to factory default. Still won't connect. Tried reinstalling HTC Sync. Doesn't recognize my phone being plugged in. I want to flash my phone back to stock so I can bring it back to Sprint but I can't bring it back rooted and I can't unroot it without using the PC. I have Googled and Googled all over but can't find an answer. I did a search here and there are similar problems but no solutions that have worked for me. Could it be the cable? It is in good condition as is the phone. Maybe the USB port on the phone? Those went bad on all my Blackberries. I'm sure this problem is expressed frequently but a response would make my day.
Click to expand...
Click to collapse
Alohaz I've had this happen 5 different times and it turned out to be the custom hboot needed for unrevoked after reverting back to original no could recognize phn

unrevoked mess up my 3 evo.
all diag port gone away.
i cant program anymore with qpst,cdma ws etc.
how to fix??

Note 4 N910C sudden USB Hardbrick, no charge, still booting fine into Android

Hello XDA, my virtual phone heros, i appreciate your good work, i am reading here for a few years as a ghost and today i signed up because i am lost with a serious problem on my Note4 N910C (English is not my native language)
THE CONDITIONS AND ENVIRONMENT:
My Phone was first running on stock Lollipop 5.1.1 when i rooted it over ODIN 3.10.6 with space X kernel and CF Autoroot, SuperSU then i flashed the latest TWRP...
After that i flashed a Custom Rom: Sweet_ROM_V17.1_COJ2_N910C...
Everything was running flawlessly for about 2 weeks...I installed Titanium Backup, Xposed, Xprivacy Pro, Busybox and a lot more and made a complete TWRP Backup then, it was running like a charme...The backup is fine because when i messed up my phone through trying harder xprivacy parameters and other tweaking i needed to set it back by TWRP into the old state...
Nothing happened after that, it was running 100% for over a week of heavy usage...
THE PROBLEM:
The one morning i took it from the charger with 100% Battery and went to work...
Before the error occured I did some searching on the internet, used chats. movies, nothing special this day, USB Debugging was On, i remembered something messed up my chrome browser like this ad hijackers, i set it back by erasing data,cache of chrome in the app menu, then there was nothing else strange i remembered, my AF Firewall was closed, only Whatsapp and Browser were allowed to going through...
The same day in the afternoon i tried to use my car charger to recharge my Note 4 as usual, but this time it wasnt recognizing the charger and my first thought was that the charger is faulty or the cable, so i turned off the phone by the androids power menu...I retried loading my battery In the phones off state but when i plug in the charger, the battery symbol came up for short and then it remained dead, it s the same scenario until today, so i used my powerbank to try charging, because the powerbank has an indicator to show the loading state and everytime i plugged it in, it came up for short, battery symbol shows up for a few seconds, but no percentage or animation is showing as usual and no red LED, then its switching off, the powerbank LED indicator stops the loading state after a few seconds, so the loading current stops...
At home i tried the stock charger and it remained the same, since that, i have to charge the battery outside the phone...
The strange thing is:
The Rom is still booting fine, TWRP is booting, but its not going into download mode from Androids Power Menu like before, its always just rebooting back into android if i choose download mode and i have to take the battery out and back in and hit the download mode pattern Vol- Home Power, to enter Download Mode and even the booting into Download mode from TWRP gives the same strange results:
On my Laptop i started the device manager to see the USB hardware string parameters after a windows popup was telling me something like "Device not recognized"
The USB Driver ID dont fit the old right driver ID, it seems to be empty and the port is not communicating anymore
since the charging bug occured,( Everything worked fine the day before.)
I tried my Laptop to narrow down the bug with the same driver i used for flashing phones (S6,910F,910C) over ODIN and my Lappy has USB 2.0 and USB 3.0 ports.
I always used the same USB 2.0 port for ODIN and other MTP stuff, but since the bug showed up the 910C is not recognized at the USB 2.0 Port anymore, seems to be dead in the devices manager table, only the USB 3.0 Port shows it as unknown device with a strange empty ID --> I tried the other devices like the N910F and G920F that are still recognized by ODIN on the same USB2.0 and 3.0 Ports both with the same USB hardware strings, its just the N910C that isnt recognized anymore, in no mode, no ADB, MTP, no download mode, everywhere the same, USB is bricked! Windows finds no driver and says its no info avaiable on this device so I tried to force the right driver to run with the wrong buggy driver ID but its not communicating, ODIN indicator and log remains unchanged...So it seems to be the same situation like other people getting from killing the bootloader by bad flashing, the only difference is that my phone is still booting fine into recovery and even Android but with no charging. My USB Port is totally useless now, its like if Samsung or Google OTA update has overwritten my bootloader or something hidden in the rom that woke up to kill my mods i dont know and now.
PS: Things i tried so far with no results on fixing my issue....
1. Complete fresh reinstall of Sweetrom, 2. Flashing another kernel...
3. Roll back to my TWRP Backup of perfect running ROM but with no USB support anymore:
The Phone remains in unknown state, not affecting ODIN to switch into flash mode
I am sure its the bootloader, since its battery bug is still occuring while the phone is in off state...
Unable to tell the charger the right ID without USB communication...
i was wondering if there is a solution to make a bootloader hotflash from out of Android or something like getting me back on stock first with download mode, forcing the USB ID or communication with a tool out of android, SD card boot image like on note 3 whatever, please tell me! I cant find something related to my USB and Charging ISSUE
PLEASE HELP ME, I am lost

Still the same. It's booting fine, USB2.0 no reaction on the laptop in Fastboot/Adb/Mtp ... On USB 3.0 Device remains unknown with strange Device ID String in windows 10 hardware Manager... Forced the old formerly working driver, but Odin can't find it anymore... Adb, Mtp, fastboot don't work, no communication... USB Cid is hard bricked, Charging never works in no state, just showing up for a few seconds in off state while plugging it in for short.... Bootloader must be damaged, fastboot and twrp can be started with dead USB... So is there a way to run a boot image to fix my bootloader from SD card, Aroma, or like OTA Updates are flashing? If Samsung and Google apply bootloader updates over OTA and simply restart, why we can't do that??? I need a new bootloader, is there any way without USB?

Greetings,
Thank you for using XDA Assist.
I have moved your question to your device's Q&A forum. You'll receive expert advice here. Good luck!

Fixed!
The problem is the USB Connector Port itself, figured it out after bending the inner contacts up with a flat screwdriver and cleaned them. Before that i always tried the same gently with no change, but please do it at your own risk only. After searching for many hours about possible reasons for the problem, I came to the conclusion to even compromise the Port and heavy bending it up, now it's charging! I will exchange the port soon and change the frame too to have it back like as new... OK, if anyone in the future have problems with the bootloader or USB hardbrick n910c, feel free to ask me, I upgraded my knowledge on many causes now
Thank you very much

My 2cents stick to one charger. Do not share that charger with others.
The worst culprit are the cheap china car chargers.
I went thru two USB ports on my first phone to figure this out.
Ever since I have adopted the policy of using only one cable. Never had this issue.

Lost ADB on PC (Unauthorized)

I have been using adb and fastboot for about 6 years now and have never had an issue with ADB. ....Now all of a sudden i cannot for the life of me get it to work or should i say for it to authorize my phone. WTF do i need to do? Im boiling over here and my phone is about to become an expensive baseball.
I have read three or four forums on people with similar issues and the "fix" doesnt work at all.
I have deleted the RSA keys from PC.
Reinstalled drivers
Rebooted phone and serverf
I have no option in my phone to revoke computer.

Soft bricked without usb debugging enabled or MTP

So as the title says, I recently lost control of my phone and in a panic full wiped everything. I figured this wouldn't be such a big problem as the hardware was fine, however, I'm now realizing that without developer mode and usb debugging enabled I can't do ANYTHING. I've tried to reflash stock via adb but the device isn't recognized, likely for the above reasons. Under normal circumstances I would just plug my phone into my computer and use MTP to move a rom over, however since the default mode is USB charging and I don't have have an OS installed, it seems I can't change that.
I've been told that it's essentially impossible to brick a nexus nowadays, but I feel like I somehow managed and for the silliest reasons. . Someone please help.
Edit: I should mention that I still have access to TWRP somehow.

cri7ica1 said:
So as the title says, I recently lost control of my phone and in a panic full wiped everything. I figured this wouldn't be such a big problem as the hardware was fine, however, I'm now realizing that without developer mode and usb debugging enabled I can't do ANYTHING. I've tried to reflash stock via adb but the device isn't recognized, likely for the above reasons. Under normal circumstances I would just plug my phone into my computer and use MTP to move a rom over, however since the default mode is USB charging and I don't have have an OS installed, it seems I can't change that.
I've been told that it's essentially impossible to brick a nexus nowadays, but I feel like I somehow managed and for the silliest reasons. . Someone please help.
Edit: I should mention that I still have access to TWRP somehow.
Click to expand...
Click to collapse
While in TWRP, use ADB Sideload and install the latest OTA zip from Google:
https://developers.google.com/android/nexus/images?hl=en
Edit: How did you reflash stock? Because you should be able to do the above, ADB push, or drag and drop via TWRP. You may have to mount the file system before doing so.
Sent from my Nexus 5X using Tapatalk

cri7ica1 said:
So as the title says, I recently lost control of my phone and in a panic full wiped everything. I figured this wouldn't be such a big problem as the hardware was fine, however, I'm now realizing that without developer mode and usb debugging enabled I can't do ANYTHING. I've tried to reflash stock via adb but the device isn't recognized, likely for the above reasons. Under normal circumstances I would just plug my phone into my computer and use MTP to move a rom over, however since the default mode is USB charging and I don't have have an OS installed, it seems I can't change that.
I've been told that it's essentially impossible to brick a nexus nowadays, but I feel like I somehow managed and for the silliest reasons. . Someone please help.
Edit: I should mention that I still have access to TWRP somehow.
Click to expand...
Click to collapse
USB OTG pre-populated with a ROM maybe?