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[Q] Boot Loop. USB not recognized. SD Card won't mount

Essentially What's wrong:
My phone is stuck in a boot loop, computers won't recognize the usb connection, and my sd card won't mount. My SD card is, however, recognizable if I plug it directly to my computer using an adapter.
What Happened:
I rooted my phone using CWM and Odin in order to remove bloatware and enable tethering. After enabling tethering, my computer stopped recognizing my phone. I tried everything to fix it including factory resetting my phone, formatting cache, data, system, and sd card all under the CWM boot menu (hold volup+home+power). Soon afterwards, my phone got stuck in a boot loop. On startup, it hangs on the white "Samsung" logo. While trying to fix the issue, I noticed that my sd card won't mount.
What I've tried:
I've tried this method, but it requires that I either have usb access or access to my phone. I've tried reinstalling the Samsung driver fifteen times. I've tried formatting the SD card in my computer. I've tried using different computers. I've tried using different usb cords. I've tried clearing the registry on my computer, I've tried scouring Google and these forums for a solution. Maybe I'm blind and missed something.
What I'm trying to do:
The way I see it, I need to figure out a way to flash the stock rom back to my phone. In order to do this, I need to get my usb to recognize. If I can do this, the rest is easy. Does anyone has any ideas on what can be done?

Cerei said:
Essentially What's wrong:
My phone is stuck in a boot loop, computers won't recognize the usb connection, and my sd card won't mount. My SD card is, however, recognizable if I plug it directly to my computer using an adapter.
What Happened:
I rooted my phone using CWM and Odin in order to remove bloatware and enable tethering. After enabling tethering, my computer stopped recognizing my phone. I tried everything to fix it including factory resetting my phone, formatting cache, data, system, and sd card all under the CWM boot menu (hold volup+home+power). Soon afterwards, my phone got stuck in a boot loop. On startup, it hangs on the white "Samsung" logo. While trying to fix the issue, I noticed that my sd card won't mount.
What I've tried:
I've tried this method, but it requires that I either have usb access or access to my phone. I've tried reinstalling the Samsung driver fifteen times. I've tried formatting the SD card in my computer. I've tried using different computers. I've tried using different usb cords. I've tried clearing the registry on my computer, I've tried scouring Google and these forums for a solution. Maybe I'm blind and missed something.
What I'm trying to do:
The way I see it, I need to figure out a way to flash the stock rom back to my phone. In order to do this, I need to get my usb to recognize. If I can do this, the rest is easy. Does anyone has any ideas on what can be done?
Click to expand...
Click to collapse
The phone not connecting: I have had this issue before. If you go into the device manager on the computer and show all devices, you can remove all the samsung usb drivers and the root usb drivers from the computer. Reboot the computer and leave the phone unplugged. it will reinstall the main drivers. reboot the phone and hold the buttons to enter recovery, it should still work even while stuck on samsung logo. connect the phone to pc and it should reinstall the drivers and connect properly.

mromblad said:
The phone not connecting: I have had this issue before. If you go into the device manager on the computer and show all devices, you can remove all the samsung usb drivers and the root usb drivers from the computer. Reboot the computer and leave the phone unplugged. it will reinstall the main drivers. reboot the phone and hold the buttons to enter recovery, it should still work even while stuck on samsung logo. connect the phone to pc and it should reinstall the drivers and connect properly.
Click to expand...
Click to collapse
Do you remember at all the name of the drivers that need to be uninstalled? When I plug in my Droid Charge, the computer attempts to install the drivers but it always fails. Under device manager I will then see "unknown deviced" labeled with a yellow exclamation mark. I uninstall that, then plug the phone back in but the same error occurs.
If there are other drivers that I need to uninstall, then I don't know what they're called. None of the devices in the manager say anything referring to samsung.

Cerei said:
Do you remember at all the name of the drivers that need to be uninstalled? When I plug in my Droid Charge, the computer attempts to install the drivers but it always fails. Under device manager I will then see "unknown deviced" labeled with a yellow exclamation mark. I uninstall that, then plug the phone back in but the same error occurs.
If there are other drivers that I need to uninstall, then I don't know what they're called. None of the devices in the manager say anything referring to samsung.
Click to expand...
Click to collapse
go to device manager and choose: view >> show hidden devices
then under the usb drivers look for and uninstall the SAMSUNG if any and uninstall the : Generic USB Hub if any, and uninstall USB Root Hub if any, and reboot computer.

THANK YOU
How don't know how I managed to miss this when trying to fix this over the past week+, but it worked. Getting rid of those root usb devices got my computer to recognize my phone, then I was able to easily use Odin to boot it back to the stock rom. Thank you so much. Crazy how such a simple solution can be the answer.

mromblad said:
go to device manager and choose: view >> show hidden devices
then under the usb drivers look for and uninstall the SAMSUNG if any and uninstall the : Generic USB Hub if any, and uninstall USB Root Hub if any, and reboot computer.
Click to expand...
Click to collapse
Hello. im having the same problem and need help. I find 2 root hubs in the drivers and uninstall them and restart computer, but it installs again the 2 root hubs after restarting computer i press (+ and poverbutton on my galaxy s plus) and then press menu button to go to the settings.. then i plug it in but it still dont recognizes the g disk.. after i reboot the phone it just shows for a little while but i cant acces it... please some advice... THANKS!"

hannu123 said:
Hello. im having the same problem and need help. I find 2 root hubs in the drivers and uninstall them and restart computer, but it installs again the 2 root hubs after restarting computer i press (+ and poverbutton on my galaxy s plus) and then press menu button to go to the settings.. then i plug it in but it still dont recognizes the g disk.. after i reboot the phone it just shows for a little while but i cant acces it... please some advice... THANKS!"
Click to expand...
Click to collapse
hi there,
i am havin the same problem. i just wanted to know if you managed to get a solution? i am desperate. please assist.

Hi there
I'm having same problem with celkon a20. It strucks on erasing data not connecting to PC....please reply me

mromblad said:
The phone not connecting: I have had this issue before. If you go into the device manager on the computer and show all devices, you can remove all the samsung usb drivers and the root usb drivers from the computer. Reboot the computer and leave the phone unplugged. it will reinstall the main drivers. reboot the phone and hold the buttons to enter recovery, it should still work even while stuck on samsung logo. connect the phone to pc and it should reinstall the drivers and connect properly.
Click to expand...
Click to collapse
Hello, have tried uninstalling the USB drivers but Windows 10 re-installs these drivers upon restart. My Samsung SM-N750 is still not detected on via USB, and therefore cannot proceed with Odin firmware flash. Do you have any other suggestions? Many thanks.

[Completed] Bricked Galaxy S Advance-No recovery mode,no download mode,undetectable by PC!

Help please! I was trying to install a custom touch recovery with Odin, as soon as i flashed it into my phone, my phone stopped and now I am unable to enter recovery or download mode, the PC doesn;t detect it and it won't boot, just shows the samsung logo with the phone model name (Galaxy S Advance). When i connect my phone to PC it just shows the loading wheel, and from that point I can't do anything with my phone, I have tried all the possible methods of connecting my phone without battery, turning it on before connecting to the usb cable etc. I also reinstalled the drivers but without success.
Please consider these issues:
*I can't enter download mode or recovery mode;
*The PC doesn't detect my phone;
*My volume buttons don't work. I used to enter recovery and download mode via adb and 300k tool, but now my phone is undetectable by PC.

XDA Visitor said:
Help please! I was trying to install a custom touch recovery with Odin, as soon as i flashed it into my phone, my phone stopped and now I am unable to enter recovery or download mode, the PC doesn;t detect it and it won't boot, just shows the samsung logo with the phone model name (Galaxy S Advance). When i connect my phone to PC it just shows the loading wheel, and from that point I can't do anything with my phone, I have tried all the possible methods of connecting my phone without battery, turning it on before connecting to the usb cable etc. I also reinstalled the drivers but without success.
Please consider these issues:
*I can't enter download mode or recovery mode;
*The PC doesn't detect my phone;
*My volume buttons don't work. I used to enter recovery and download mode via adb and 300k tool, but now my phone is undetectable by PC.
Click to expand...
Click to collapse
Hi, thanks for using XDA assist!
First, please create an account so you can post in other forums.
Here is your device's main forum area:
(You should bookmark this)
http://forum.xda-developers.com/galaxy-s-advance
After creating your account, please ask your question here:
http://forum.xda-developers.com/showthread.php?t=1690709
The experts for your device are located there and will be able to help.
Good luck!

[Completed] LG Volt - Can't factory reset or DL mode, not connecting with PC

Picked up a used LG Volt from eBay for cheap, seller said device is user-locked. First thing I noticed is this is a Boost phone and there is a Sprint sim installed. Thought someone might have been monkeying with the internals. The phone is pattern-locked. I have tried every conceivable combination of button presses/holds and the device will NOT enter recovery mode. All I get is the LG logo coming on and the notification light glowing, then the logo and light disappears, then the logo comes on for a couple seconds then back off again and keeps repeating this cycle.
I connected it to my PC but, since I can't unlock the screen I can't set the phone as a removeable drive and it does not connect to the PC. I have installed the LG Drivers and tried to put the phone in DL mode, however, it is still not recognized by the PC. If I open up device manager on my PC and then plug the phone in the device manager rolls up and back down again like it is trying to figure something out, but the device still does not show up . I have installed/uninstalled the drivers and rebooted my PC several times in hopes that it would connect. I have tried a couple of Android managers on the PC but they don't recognize the Volt either. I have booted the PC into Linux and tried to work with it there but, again, it is never recognized. I have read several post concerning flashing in DL mode, even installed LG Flash Tool, but since the Volt isn't recognized the procedure comes to a halt. I read about ADB but I can't unlock the phone to set debugging and, I believe, the phone needs to be recognized by the PC.
If I could just get past the pattern-lock or get the PC to connect to the phone I feel I might have a chance fixing it.

Hi,
Thanks for using XDA assist.
There is a dedicated thread for you to post this question:
New LG Volt LS-740
Over there, you can receive specialized help from experts.
Good Luck! - gsstudios

HELP! Can't connect to PC

Hi guys, i'm getting this problem and cant connect to pc and i think i've tried it all.
when i connect my phone to the PC, it stars charging but my pc doesn't recognize the device, and my phone doesn't show the notification to make it file transfer.
Could it be a computer issue?
it seems not, i've uninstalled and installed drivers (ADB and Fastboot, oneplus drivers, google drivers) and the problem persist, and even try it on another computer and its the same, the phone does not appear even on Device Manager.
Could it be the Cable?
I don't think so, i'm using the original oneplus cable, it use to work really well before, and i have even connect other phone with the same cable and the other phone is recognize by the computer, so it''s not a cable issue... but I still when to a Tech-store and try other USB-C cables with their computer but my issue still persist (phone isn't recognize, just charge).
Could it be a phone software issue?
Maybe? but i discover this issue 3 weeks ago and a i was on EVOX rom and i thought it would be solved flashing another rom, and i CLEAN FLASH Resurrection Remix Rom, but then the problem was still there!
cant connect even on FASTBOOT MODE...
BTW, before installing RR, i Installed OOS 10.3.4, and still my computer doesnt recognize the phone, YES i have enabled developer options and USB debugging is enabled, and USB PREFERENCES to File transfer, but its not helping me, the "usb for" option its all grayed out and cant change that.
Right now i'm stuck on a RR build without Gapps, and i lost ROOT and RECOVERY, and as you may think, i cant install any of them because i cant connect to my pc, so i'm in a pretty difficult situation here hehe, could you please help me out?

This helped me. Hope it works for you too
I can't paste the link but search "how to get your Android device to show up in file explorer" by how to geek.

Didn't work
xnruaa said:
I can't paste the link but search "how to get your Android device to show up in file explorer" by how to geek.
Click to expand...
Click to collapse
Thanks for your reply, but this didn't work because my device isn't shown on device & printers, or anywhere as far as i checked...

PROBLEM SOLVED.
I think this is the silliest solution I've ever seen, it was just DUST, i clean my USB-C PORT (with a mask xD) and then pluggin, AND VOILA, it worked!!! so keep your ports clean everyone

Doogee S68 Pro

Hi,
I've a Doogee S68 Pro that had a corrupt bootloader and crashed as soon as the Doogee welcome screen came up. I couldn't access the recovery boot loader so downloaded SP flash and started to format and download the firmware. This didn't go well and now the screen is black and doesn't show anything. When connected to my PC the phone keeps connecting and disconnecting all the time and the SP Flash doesn't download to it, presumably as the pc connects and disconnects...
Any one any ideas ?

UPDATE
Phone still has black screen and doesn't even show up when using platform tools adb devices.
When I plug the phone into a USB slot it shows up as a USB serial device or a DA VCOM device. SP Flash will start the DA side but comes up with an Error Hash Mismatch ?
I'm thinking this is now an expensive paper weight ?