Unknown Device error. - Android Q&A, Help & Troubleshooting

Hello,
today i was trying to flash my i6 clone, and flashtools showed me an error.
Then i tried to flash another time the phone but now my pc doesnt recognize it, when i connect the usb, windows show me the error of an unknown device. I tried to change the usb port, i tried to install adb drivers and mtk preloaders, but nothing, i get the same error always.
Someone can help me?
Thank you!!

Anyone can help me?? :S

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[Q] Phone not starting after unsuccessful flashing

Hello all,
I have a rooted Micromax A58 which was perfectly working. I did a full nandroid backup of it 2 days ago. On yesterday, I was moving some system app (google maps, play store etc) to SD with some software) so that I could increase the internal memory and install some other softwares. But, unfortunately, after that modification, the phone stopped working properly (it was stucking up when the BOLT logo was reached). So, I started it in recovery and do a wipe cache and factory reset. After that, the phone is always going to Factory Mode.
Then I tried to Flash the Stock ROM using Flash Tool but was unsuccessful multiple times. After the scatter file selected, when I clicked the 'Download' (or even firmware upgrade), all time time, the phone was disconnecting/reconnecting every now and then and nothing happened after (even though I already installed the Vcom and PdaNet driver in the PC). So, I had to quit. I am attaching herewith the logs of the Flash Tool lastly tried.
Now, when I am starting the phone power button, nothing is happening.. NOTHING but black screen...
I am a bit worried.. your help very much appreciated. Please let me know for any information needed. Thanks.
'No com port detected' error
I tried another time and the problem still there.. When in SP Flash Tool, I select scatter file, click 'Download' and connect the phone to PC, the process doesn't progress further. So, I have to finally click 'Stop' to quit. In the logs, it shows--
"No com port detected.."
Attaching the trace logs file herewith.
Please advice how to resolve the issue.. I am totally stuck now. Thanks.
Androhelp said:
Hello all,
I have a rooted Micromax A58 which was perfectly working. I did a full nandroid backup of it 2 days ago. On yesterday, I was moving some system app (google maps, play store etc) to SD with some software) so that I could increase the internal memory and install some other softwares. But, unfortunately, after that modification, the phone stopped working properly (it was stucking up when the BOLT logo was reached). So, I started it in recovery and do a wipe cache and factory reset. After that, the phone is always going to Factory Mode.
Then I tried to Flash the Stock ROM using Flash Tool but was unsuccessful multiple times. After the scatter file selected, when I clicked the 'Download' (or even firmware upgrade), all time time, the phone was disconnecting/reconnecting every now and then and nothing happened after (even though I already installed the Vcom and PdaNet driver in the PC). So, I had to quit. I am attaching herewith the logs of the Flash Tool lastly tried.
Now, when I am starting the phone power button, nothing is happening.. NOTHING but black screen...
I am a bit worried.. your help very much appreciated. Please let me know for any information needed. Thanks.
Click to expand...
Click to collapse
Try changing the ports, Cable etc or better off try on a different computer .
Port/Cable/PC change didn't help
kapil_dheer said:
Try changing the ports, Cable etc or better off try on a different computer .
Click to expand...
Click to collapse
Hello Kapil,
Thanks for the response. Yesterday I tried with separate laptop, but the same problem was there. Today, I tried with the different USB port.. but didn't help.
It seems that the driver can not recognize the device and when I connect the phone, it is just in a loop of disconnecting/re-connecting. Please advice further. Thanks.
Only option now seems is Service Centre.
The guys are pretty dumb. I've tested samsung motorola etc.....they don't even know what root is.
Maybe they'll be unable to identify what you tried to do.
You can give any reason for it not functioning.
Good luck.
kapil_dheer said:
Only option now seems is Service Centre.
The guys are pretty dumb. I've tested samsung motorola etc.....they don't even know what root is.
Maybe they'll be unable to identify what you tried to do.
You can give any reason for it not functioning.
Good luck.
Click to expand...
Click to collapse
Thank you Kapil for the advice. As Micromax service centre is not having a good reputation regarding these, so I would go for that option as the last resort.
Before that, can I please ask the other members for giving further advice if there is any option to try with.. Thanks for your help.
Managed to get phone reconized in PC usb-pls help further
Androhelp said:
Thank you Kapil for the advice. As Micromax service centre is not having a good reputation regarding these, so I would go for that option as the last resort.
Before that, can I please ask the other members for giving further advice if there is any option to try with.. Thanks for your help.
Click to expand...
Click to collapse
I have managed to get the phone recognized by PC usb now. But, when I try try the SP Flash utility to either Format or Download or Firmware update etc, it is throwing error like below--
09/16/2014 09:56:32.640 FlashTool[2212][3912][D]: APCore::Connection::ConnectDA(): Failed to Connect DA: S_FT_ENABLE_DRAM_FAIL(..\QT_FlashTool_Refactor\Conn\Connection.cpp,126)
09/16/2014 09:56:38.140 FlashTool[2212][3912][D]: BackgroundWorker::run(): BROM Exception! ( BROM ERROR : S_FT_ENABLE_DRAM_FAIL (4032)
[EMI] Enable DRAM Failed!
[HINT]:
Please check your load matches to your target which is to be downloaded.)((APCore::Connection::ConnectDA,..\QT_FlashTool_Refactor\Conn\Connec​tion.cpp,127))(..\QT_FlashTool_Refactor\UI\src\BackgroundWorker.cpp,94)
09/16/2014 09:56:58.765 FlashTool[2212][2708][D]: OptionDialog::winEvent(): USB Device Removed.(..\QT_FlashTool_Refactor\UI\src\OptionDialog.cpp,483)
09/16/2014 09:56:59.750 FlashTool[2212][2708][D]: OptionDialog::winEvent(): USB Device plug in.(..\QT_FlashTool_Refactor\UI\src\OptionDialog.cpp,478)
09/16/2014 09:57:33.828 FlashTool[2212][2708][D]: OptionDialog::winEvent(): USB Device Removed.(..\QT_FlashTool_Refactor\UI\src\OptionDialog.cpp,483)
09/16/2014 09:57:34.812 FlashTool[2212][2708][D]: OptionDialog::winEvent(): USB Device plug in.(..\QT_FlashTool_Refactor\UI\src\OptionDialog.cpp,478)
09/16/2014 09:58:08.890 FlashTool[2212][2708][D]: OptionDialog::winEvent(): USB Device Removed.(..\QT_FlashTool_Refactor\UI\src\OptionDialog.cpp,483)
09/16/2014 09:58:10.375 FlashTool[2212][2708][D]: OptionDialog::winEvent(): USB Device plug in.(..\QT_FlashTool_Refactor\UI\src\OptionDialog.cpp,478)
I tried the above multiple times but everytime same error as above.
When tried to connect the phone (without battery) it is disconnect/reconnect in an endless loop.
When try to connect with battery, the disconnect/reconnect loop is gone (i.e.-stable) but sometime it can not identity phone ('Unknown Device').
Also tried to press volume down button along with battery inside, but showing 'Unknown Device' and Flash tool getting hanged.
I used the Stock Rom downloaded from xda site for my phone detailed below---
Android 4.2.2
Model Micromax A58
BaseBand version- MOLY.WR8.W1315.MD.WG.MP.V1.P11 2013/09/04 15:51
Kernel 3.4.5 [email protected] #1
Build Number Micromax A58_T09
I also have the good nandroid backup (if it could be of any use) but phone is dead now. Confused how to go forward. Please help.
Download in SP Flash Tool successful
Androhelp said:
I have managed to get the phone recognized by PC usb now. But, when I try try the SP Flash utility to either Format or Download or Firmware update etc, it is throwing error like below--
09/16/2014 09:56:32.640 FlashTool[2212][3912][D]: APCore::Connection::ConnectDA(): Failed to Connect DA: S_FT_ENABLE_DRAM_FAIL(..\QT_FlashTool_Refactor\Conn\Connection.cpp,126)
09/16/2014 09:56:38.140 FlashTool[2212][3912][D]: BackgroundWorker::run(): BROM Exception! ( BROM ERROR : S_FT_ENABLE_DRAM_FAIL (4032)
[EMI] Enable DRAM Failed!
[HINT]:
Please check your load matches to your target which is to be downloaded.)((APCore::Connection::ConnectDA,..\QT_FlashTool_Refactor\Conn\Connec​tion.cpp,127))(..\QT_FlashTool_Refactor\UI\src\BackgroundWorker.cpp,94)
09/16/2014 09:56:58.765 FlashTool[2212][2708][D]: OptionDialog::winEvent(): USB Device Removed.(..\QT_FlashTool_Refactor\UI\src\OptionDialog.cpp,483)
09/16/2014 09:56:59.750 FlashTool[2212][2708][D]: OptionDialog::winEvent(): USB Device plug in.(..\QT_FlashTool_Refactor\UI\src\OptionDialog.cpp,478)
09/16/2014 09:57:33.828 FlashTool[2212][2708][D]: OptionDialog::winEvent(): USB Device Removed.(..\QT_FlashTool_Refactor\UI\src\OptionDialog.cpp,483)
09/16/2014 09:57:34.812 FlashTool[2212][2708][D]: OptionDialog::winEvent(): USB Device plug in.(..\QT_FlashTool_Refactor\UI\src\OptionDialog.cpp,478)
09/16/2014 09:58:08.890 FlashTool[2212][2708][D]: OptionDialog::winEvent(): USB Device Removed.(..\QT_FlashTool_Refactor\UI\src\OptionDialog.cpp,483)
09/16/2014 09:58:10.375 FlashTool[2212][2708][D]: OptionDialog::winEvent(): USB Device plug in.(..\QT_FlashTool_Refactor\UI\src\OptionDialog.cpp,478)
I tried the above multiple times but everytime same error as above.
When tried to connect the phone (without battery) it is disconnect/reconnect in an endless loop.
When try to connect with battery, the disconnect/reconnect loop is gone (i.e.-stable) but sometime it can not identity phone ('Unknown Device').
Also tried to press volume down button along with battery inside, but showing 'Unknown Device' and Flash tool getting hanged.
I used the Stock Rom downloaded from xda site for my phone detailed below---
Android 4.2.2
Model Micromax A58
BaseBand version- MOLY.WR8.W1315.MD.WG.MP.V1.P11 2013/09/04 15:51
Kernel 3.4.5 [email protected] #1
Build Number Micromax A58_T09
I also have the good nandroid backup (if it could be of any use) but phone is dead now. Confused how to go forward. Please help.
Click to expand...
Click to collapse
In the meanwhile, when trying to resolve the issue, I tried the following steps and after that, I lastly managed to 'download' the Stock ROM successfully in my phone (using the Windows XP OS)--
1) As I was always getting the SP Flash Tool error 4032 for last couple of days and which was clearly describing 'please check your load matches your target which is to be downloaded', so was investigating the root cause in details. Upon searching in the internet, I downloaded multiple version of Stock ROMs for my Micromax A58 model from different sources to give a try. When trying to 'Download' (in SP Flash Tool), the 'T_09' ROM (link given by 'alanvmathew') in the below mentioned URL worked for me.
http://forum.xda-developers.com/showthread.php?t=2610046&page=2
It is to be noted from the link that Micromax A58 model have 2 different Stock ROMs (i.e.- 'T_07' and 'T_09') which info I was missing all the time.
2) After identifying the scatter file in the SP Flash Tool and clicking the 'Download' option, I inserted battery in the phone and pressing the 'Power + Volume down' button, connected the device into the PC USB. Upon connected, the 'DA USB VCOM PORT' driver automatically installed and the 'Download' started and flashing of ROM went smooth. Finally, it ended up with green 'Download OK' message. Also attaching the snapshots herewith.
Will check the mobile and its performance further and revert back accordingly.

GT-I5839i Drivers for Download mode

Hello everyone. i got my Galaxy Ace GT-i5839i stuck on bootloop and i watn to flash the rom again from all over start because from the recovery i got a message after factory reset everything and when i press restart i got error saying ''cant mount / DataRebooting'' or something.
is there any fix for that besides the odin? i yes please tell me how. if no please tell me how can i get the proper drivers for this phone, i have tried everything and cannot do with the drivers, i got windows 7 and the computer recognises it correctly but at the drivers it installs ther is an exclamation mark and odin is not recognising it.
please any help to fix my phone.
thanks alot.

How to fix Acer Liquid E2 after flashing the wrong Preloader?

Hi..
I Have a problem with my Acer Liquid E2 Dual Sim..
Before this, my problem is the phone was stuck in the Ace green logo (Bootloop) and i tried to flash it using SP flash tool, and it flashed succesful until the green circle, but my device gotten even worse, now when i turn on the power, it just vibrate once and continue in blank screen only..and when i try to connect it to the pc, it recognize with a vibrate and blue led turning on, but in the device manager, it detects as MTK USB Port, the is no MTK Preloader or any driver except the mtk usb port
I already googled it, and it seems because i flashed the wrong preloader (it means i used the wrong firmware in the spflashtool), but i downloaded it from the global acer download, And another information i get that my device is in a condition where it enters the low-layer download interface of the MT65xx device (AFAIK).. Thats why it only detects as MTK USB Port. So what to do now? I have tried using SPFlashTool to Dwonload only the preloader checked using from two different rom, but no success both? already tried any different version spflashtool
Every time i tried to download the preloader to the device using spflashtool it just shows "dram failed"
like this
"BROM ERROR : S_FT_ENABLE_DRAM_FAIL (4032)
[EMI] Enable DRAM Failed!"
Does anyone knows how to fix it
Anyboy can help me pleaasee
lukerodriguez said:
Anyboy can help me pleaasee
Click to expand...
Click to collapse
i have same problem bro, is your phone already fix?

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