Help abdsurd problem XPERIA U can't boot - Sony Xperia P, U, Sola, Go

Hi and sorry for my english, i don't have this phone but other Sony and i'm trying to tepair Xperia U of my friend that doesn't boot anymore,
The phone have 2 month of life and is all original, not rom root or other and hasn' connected to PC. But one day it doesn't stated anymore: press power button, vibrate, after appear the write SONY and remain the same for infinity!
After various attempt with my PC, PC COMPANION and FLASHTOOL i'm realized that the phone work with firmare 4.0 but it lag a lot and is unusable! And i don'know why but anyone firmware stock works!!!!! It loop on the write SONY but not started||||:crying::crying::crying:
Does anyone know what's happenend? Or what can i do??
Thanks

Download firmware from internet and reflash it
Sent from my ST25a using XDA Premium 4 mobile app

Related

HELP xperia x10

Hi everybody
I need help for my friends xperia x10.
I dont know a lot about Sony Ericsson because im using Samsung Galaxy S.
This xperia x10 was with firmware 1.6 and he tried to upgrade to 2.1. After upgrade he had a lot of problems whith the phone, actually the sound was not working for some days then according to my friend it didnt boot anymore.
The problem with the phone is like this: when you press the power button it vibrates and you can see only the black screen for few seconds. After that restarts and this repeats all the time. When i connect to pc it cant find the drivers.
Please if somebody can help me to solve this because in my country we dont have Sony Ericsson care center.
Thanks in advance and sorry for my bad english
Sent from my GT-I9000 using XDA App
Download SEUS and do a repair.
Sent from my X10project using XDA Premium App
realunited123 said:
Download SEUS and do a repair.
Sent from my X10project using XDA Premium App
Click to expand...
Click to collapse
I used SEUS and updated to 2.2 but i have again the same problem, it keep restarting. I cant get even the boot animation or logo. Anyway thanks for trying to help
cipiculla said:
I used SEUS and updated to 2.2 but i have again the same problem, it keep restarting. I cant get even the boot animation or logo. Anyway thanks for trying to help
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?t=928343
rendeiro2005 said:
http://forum.xda-developers.com/showthread.php?t=928343
Click to expand...
Click to collapse
Thanks for the help but this didnt work too
During the flash I dont get the pop up message and in the end of the flash i get this lines
INFO - Flashing finished.
INFO - Now unplug the device and power it on
INFO - Then go to application settings
INFO - turn on Unknown Sources and Debugging
After i turn the phone on it repeats again the same thing. It does'nt display anything just after few seconds it restarts again and again, all the time.
Please if somebody can help me. I just want to know if it can be repaired or not, or is it maybe any hardware problem!!!
if SEUS, PCCompanion or flashtool can´t do the job you may have some hardware issues. in that case, if you have warranty still valid, use it.
cipiculla said:
Thanks for the help but this didnt work too
During the flash I dont get the pop up message and in the end of the flash i get this lines
INFO - Flashing finished.
INFO - Now unplug the device and power it on
INFO - Then go to application settings
INFO - turn on Unknown Sources and Debugging
After i turn the phone on it repeats again the same thing. It does'nt display anything just after few seconds it restarts again and again, all the time.
Please if somebody can help me. I just want to know if it can be repaired or not, or is it maybe any hardware problem!!!
Click to expand...
Click to collapse
Here is an even more specific step by step guide for AT&T noobs....
http://forum.xda-developers.com/showthread.php?t=1012380
Usually when the flash tool aborts like that, it is due to either a) battery isn't fully charged or b) there's a problem with the ftf file you downloaded. Try charging battery first and a new download of the ftf firmware.
hy i have an xperi x10 and i upgrade it whit the xperia mini firmware an now my phone freezes on startup and companion says tht i have the latest update and it wount do anything pls help !
wizzard_2009 said:
hy i have an xperi x10 and i upgrade it whit the xperia mini firmware an now my phone freezes on startup and companion says tht i have the latest update and it wount do anything pls help !
Click to expand...
Click to collapse
Have you tried to repair (not update) in PC companion ?
Have you tried with SEUS ?
wizzard_2009 said:
hy i have an xperi x10 and i upgrade it whit the xperia mini firmware an now my phone freezes on startup and companion says tht i have the latest update and it wount do anything pls help !
Click to expand...
Click to collapse
Why would you update it with an xperia mini firmware anyway?
No Xrecovery backup ?

[Q] /help BRICKED XPERIAMINI AND SHOWS A PIC DAT IVE NEVER SEEN OR READ ABOUT

folks! I bricked my phone while updating it from seus and reason was dat MY USB CABLE WAS LOOSE AND MY PHONE GOT DISCONNECTED nw on restart it shows sony ericcson logo just for a second and den shows a pic where a triange(and inside it an exclamation mark is shown) is placed over a phone's picture.
I've tried seus and flashtool and both detect my phone as long as that sony ericson logo is shown and dats just for a second.
I was using cwm recovery and had made a backup of the custom rom. And nw i cant acces my cwm coz the se logo flashes so shortly dat i am nt able to open cwm.
NEED HELP GUYS!!!
Also i want to know dat can the sony ericsson service center help me..by software installation or by changing the hardware which stores the flash memory. Plz help me i'm nt ready to throw this phone away.
Thanks.
Use FlashTool to FLASH.
I have made a guide with links included. Just search for :
2.1.1.A.0.6 GREEK .ftf
Sent from my U20i using XDA Premium App
leajian said:
Use FlashTool to FLASH.
I have made a guide with links included. Just search for :
2.1.1.A.0.6 GREEK .ftf
Sent from my U20i using XDA Premium App
Click to expand...
Click to collapse
Thanks buddy.. But Flash tool does not detect my device. I've installed gordons gate.. But still.. I think Flash tool does not get enough time to detect my phone. I hear a usb connection sound and SE logo flashes for less then a second and i hear a usb disconnection sound den the ! is seen and den phone shuts down.
Dinesh1389 said:
Thanks buddy.. But Flash tool does not detect my device. I've installed gordons gate.. But still.. I think Flash tool does not get enough time to detect my phone. I hear a usb connection sound and SE logo flashes for less then a second and i hear a usb disconnection sound den the ! is seen and den phone shuts down.
Click to expand...
Click to collapse
Don't give up yet. I know this problem. Uninstall Gordon's Gate. Install Sony Ericsson PC Companion (again if installed) and try using FlashTool again. This error on your phone means that the files are corrupted, maybe because a flash you tried was interuppeted unexpectedly. Your phone is not dead yet (probably your USB port has some problems and caused all this), it must be restorable.
Try and tell me if it worked.
Sent from my U20i using XDA Premium App
No dont throw it just yet, I had almost the same. Ut unsure what caused it,it was 1st time flashing it, but spent 24hrs looking though solutions but it worked, similar to what lea sez...a new dl of sony comp and re-updated it using there latest u.d. Then used flashtool and reinstalled xrecovery with it as it stopped letting me open it..took a few trys but ws ok once sony companion recd my phone an reinstalled xrec.the update in sony comp I think wasnt in clear view its in the support stn..went back to stock 2.1.
Sent from my U20i using XDA App
leajian said:
Don't give up yet. I know this problem. Uninstall Gordon's Gate. Install Sony Ericsson PC Companion (again if installed) and try using FlashTool again. This error on your phone means that the files are corrupted, maybe because a flash you tried was interuppeted unexpectedly. Your phone is not dead yet (probably your USB port has some problems and caused all this), it must be restorable.
Try and tell me if it worked.
Sent from my U20i using XDA Premium App
Click to expand...
Click to collapse
Didnt worked man... So i had to choose the last option left ... the se service guyz... nw it back on the track.

Pls help with xperia x10i

Hello, I have a sonyericsson xperia X10 suddenly stopped turning, i tried to repair it with the FlashTool, the flash process its ok , but at the end of the process and turn it , vibrates only once and not on the lcd (black), and when i reconnect to the PC, the phone is in flash mode again., pls which files or Fw additional need install first for repair?? thks for your time pd i use the fw x10i generic stock and pc companion not repair it display a error in upload the sw to phone.
Please use search tab all is there.Take your time and read.
thks for your time, itried all methods mentioneh in the posts but nothing work, for this reason i need help thks...
I installed a Rom that went wrong and had to use flashmode with sony's update program, not sure how it's called these days. I if you install that and plug it into the pc holding down the Back button, it recognizes it and will all you what you want to do. Select restore (or something similar). It'll restore it back to 2.3.3. After that you can install xRecovery again with flash tool.
Be aware that this worked for my semi bricked X10i, no guarantee it'll work for you ofcourse.......good luck
Sent from my X10S using xda premium
Thks, i tried this for 2 days, but in the Pc companion display the message " no exist software update for your phone", later, put on the phone and noting, only one vibrate and the lcd is permanently black, i put again to usb/pc and display the message SEMC flash.... , pls exist a solution for this issue??? thks
You only get that message when you plug in the phone too early
Update>repair>select x10i>then press continue etc>THEN connect phone.
And run stuff as administrator if you got w7.
Sent from my X10i using xda premium
I tried to repair with pc companion , but adter the finish os the process display ok , but the phone stuck in flash mode all time...
Yoy can try flashing a different kernel.Ive had all sirts of errors and failures,something always works.
Charge battery
Try other flashtool version
Try x10 flasher
sent by my x10i using xda premium
ok i tried this options thks
I tried with diffrent kernels but not working , exist a guide for repair this issue, my x10i its always in flash mode, flash with flash tool and again stays in flash mode
Use SE update service maybe it works for you..
Sent from my X10 using XDA

[Q] Sony Xperia Neo L bricked!

hi all,
I need help and here's my story.
I got Sony Xperia Neo L 3 weeks ago. it was running fine but suddenly it didn't turned up. I showed it to nearby general mobile repairing shop. 3 days later he gave my phone back but it was all chinese. when i turn it on some china unicom and chinese text logo appear before sony and xperia logo, same while turing off and most of the apps are in chinese even i set language to english. I complained him but he told that's all he can do and i have to pay him for this chinese sofware.
Then one of my friend told me that rooting it will solve the problem as he used to root friends tablets and phones so i ask him to help me. First he tried to update my phone through sony update service but chinese software was still there after updating. then he tried to root it and i was watching while he was doing it and there was lots of errors while running runme.bat. so he gave up.
Now my phone is kinda dead. it's not turning on. when i connect it to my pc it says usb device not recognized. only orange light keep blinking same happens while charging in wall socket. i've tried different ports, different pc, charged for whole night but nothing helps. now i couldn't update or root as it's not detected by pc. (there is no any sony service center in my region) i am having big trouble so it would be great help if anybody guide me what to do.
can't repaire because phone is not turning on. haven't rooted. no service center near by. totally sucked.
i am facing the same problem , any solution yet.????
Please help me ...
Xperia Neo L bricked... Need Help...
I have tried to flash my Xperia Neo L phone to a custom rom and it is bricked now
I have rooted the phone first, then installed CWM recovery and then installed the custom rom. after that when my phone is not starting or booting
Nothing comes up
No booting. If I press the power button, then it will blink the red led few times
I tried to flash it again in flash recovery and when I connect the phone in recovery, computer could not identify the device and the driver installation failed
Can someone help me?
[email protected] :good:
ginsmon said:
I have tried to flash my Xperia Neo L phone to a custom rom and it is bricked now
I have rooted the phone first, then installed CWM recovery and then installed the custom rom. after that when my phone is not starting or booting
Nothing comes up
No booting. If I press the power button, then it will blink the red led few times
I tried to flash it again in flash recovery and when I connect the phone in recovery, computer could not identify the device and the driver installation failed
Can someone help me?
[email protected] :good:
Click to expand...
Click to collapse
Dude, your battery is low. Charge it up!
Sent from my Xperia Neo V using XDA Premium 4 mobile app
---------- Post added at 05:27 PM ---------- Previous post was at 05:23 PM ----------
rawbean said:
hi all,
I need help and here's my story.
I got Sony Xperia Neo L 3 weeks ago. it was running fine but suddenly it didn't turned up. I showed it to nearby general mobile repairing shop. 3 days later he gave my phone back but it was all chinese. when i turn it on some china unicom and chinese text logo appear before sony and xperia logo, same while turing off and most of the apps are in chinese even i set language to english. I complained him but he told that's all he can do and i have to pay him for this chinese sofware.
Then one of my friend told me that rooting it will solve the problem as he used to root friends tablets and phones so i ask him to help me. First he tried to update my phone through sony update service but chinese software was still there after updating. then he tried to root it and i was watching while he was doing it and there was lots of errors while running runme.bat. so he gave up.
Now my phone is kinda dead. it's not turning on. when i connect it to my pc it says usb device not recognized. only orange light keep blinking same happens while charging in wall socket. i've tried different ports, different pc, charged for whole night but nothing helps. now i couldn't update or root as it's not detected by pc. (there is no any sony service center in my region) i am having big trouble so it would be great help if anybody guide me what to do.
Click to expand...
Click to collapse
What I got from this is that he had already put in some custom firmware. You should've gone to the Exclusive Service Centre.
You must try updating it using SEUS again or try fishing stock firmware using Flashtool. This should help. Do give a feedback as to what happened next... Here to help!
Sent from my Xperia Neo V using XDA Premium 4 mobile app
Fixed. Could you please help with a best rom for Xperial Neo L
ginsmon said:
I have tried to flash my Xperia Neo L phone to a custom rom and it is bricked now
I have rooted the phone first, then installed CWM recovery and then installed the custom rom. after that when my phone is not starting or booting
Nothing comes up
No booting. If I press the power button, then it will blink the red led few times
I tried to flash it again in flash recovery and when I connect the phone in recovery, computer could not identify the device and the driver installation failed
Can someone help me?
[email protected] :good:
Click to expand...
Click to collapse
Thank you "karanrajkapur". I charged my phone for a complete day and now using the flash tool I restored the original ROM from Sony.
Could you please help with a best rom for Xperial Neo L
ginsmon said:
Thank you "karanrajkapur". I charged my phone for a complete day and now using the flash tool I restored the original ROM from Sony.
Could you please help with a best rom for Xperial Neo L
Click to expand...
Click to collapse
There's nothing like a good or a comparably better ROM. It's all about personal favourites. There are different ROMs based on different parameters. It's totally your call. Either go for a performance based or a battery based ROM.
Happy Flashing!
Sent from my Xperia Neo V using XDA Premium 4 mobile app
Sony Xperia Neo L bricked
hey i got a problem regarding my xperia neo l...
i tried to root it but now its all bricked...when i press the power button only a red light blinks three times and it doesn't get switched on....whenever i connect it through usb it gives message "usb doesn't recognize the device".....i tried updating but it gives message - "your device is already up to date"....i also tried the option to repair it by pc companion but as its not detecting through usb cable...its nt helping...i even tried to unbrick it using flashtool but it's not detecting the phone...so again its nothing...
please help...
i've tried a lot but didn't get any solutions yet...(((
try charge the battery
Bro phone shariyayo? My phone also have tge same problem(sony xperia neo l) can your
ginsmon said:
I have tried to flash my Xperia Neo L phone to a custom rom and it is bricked now
I have rooted the phone first, then installed CWM recovery and then installed the custom rom. after that when my phone is not starting or booting
Nothing comes up
No booting. If I press the power button, then it will blink the red led few times
I tried to flash it again in flash recovery and when I connect the phone in recovery, computer could not identify the device and the driver installation failed
Can someone help me?
[email protected] :good:
Click to expand...
Click to collapse
Bro phone shariyayo? My phone also have tge same problem(sony xperia neo l) can your

[Q] Sony Xperia Neo L not getting switched on

My mobile Sony Xperia Neo L is not getting switched on. It got turned off on its own. My mobile was under the below explained situation before it stopped working.
1. I was getting alerts saying - LOW PHONE MEMORY IS AVAILABLE delete some data. It had 43 MB left in phone memory.
2. Memory card was also full the day before.
3. I was not able to install any applications.
4. Since I have activated the auto update for few applications like Whatsapp, google maps etc. For them also i used to get alerts saying - INSUFFICIENT STORAGE IS AVAIALABLE TO UPDATE the software.
5. I always keep Wi-Fi on in my mobile. (If any open Wi-Fi is available mobile will get updates)
6. Battery was more than 30% charged.
All of the above may be the reasons for software problem.
No time in the past phusical harm happened to the phone, Since i bought in 2012 August.
I had gone through Sony Support Center to repair, but still it didnt worked.
Could any one help me to solve the problem ?
NSatya said:
I had gone through Sony Support Center to repair, but still it didnt worked.
Could any one help me to solve the problem ?
Click to expand...
Click to collapse
Even sony can't help you how can we help you ?
Through sony support center i had upated the OS. In fact my phone was having latest version of OS than what I had installed through Sony.
NSatya said:
My mobile Sony Xperia Neo L is not getting switched on. It got turned off on its own. My mobile was under the below explained situation before it stopped working.
1. I was getting alerts saying - LOW PHONE MEMORY IS AVAILABLE delete some data. It had 43 MB left in phone memory.
2. Memory card was also full the day before.
3. I was not able to install any applications.
4. Since I have activated the auto update for few applications like Whatsapp, google maps etc. For them also i used to get alerts saying - INSUFFICIENT STORAGE IS AVAIALABLE TO UPDATE the software.
5. I always keep Wi-Fi on in my mobile. (If any open Wi-Fi is available mobile will get updates)
6. Battery was more than 30% charged.
All of the above may be the reasons for software problem.
No time in the past phusical harm happened to the phone, Since i bought in 2012 August.
I had gone through Sony Support Center to repair, but still it didnt worked.
Could any one help me to solve the problem ?
Click to expand...
Click to collapse
One last try you can give... Connect your phone to the charger and check if the led turns on.. Or else connect USB to the phone... While plugging it to the computer, hold the back button.... Check for the led light to turn GREEN... If this happens, then nothing wrong has happened to your phone.. Else no one can help you... PM me for further help..
cherry676 said:
One last try you can give... Connect your phone to the charger and check if the led turns on.. Or else connect USB to the phone... While plugging it to the computer, hold the back button.... Check for the led light to turn GREEN... If this happens, then nothing wrong has happened to your phone.. Else no one can help you... PM me for further help..
Click to expand...
Click to collapse
I have done as you said, LED light turned green... If there is no problem, y it is not getting switch on ?
I really appreciate your response.
AW: [Q] Sony Xperia Neo L not getting switched on
NSatya said:
I have done as you said, LED light turned green... If there is no problem, y it is not getting switch on ?
I really appreciate your response.
Click to expand...
Click to collapse
If led turns green than install flash tool to your PC, download latest ftf file for your phone and flash the ftf to your phone. But flash not whole rom parts, only flash kernel within that ftf.
Gesendet von meinem Galaxy Nexus mit Tapatalk 2
motorazrv3 said:
If led turns green than install flash tool to your PC, download latest ftf file for your phone and flash the ftf to your phone. But flash not whole rom parts, only flash kernel within that ftf.
Gesendet von meinem Galaxy Nexus mit Tapatalk 2
Click to expand...
Click to collapse
Thanks for your reply, could you please provide the steps to do what you said..
If u from india then u can call me I can fix ur problem. Just dwnld flashtool and firmware of neo l then flash it
Sent from my MT25i using xda premium
motorazrv3 said:
If led turns green than install flash tool to your PC, download latest ftf file for your phone and flash the ftf to your phone. But flash not whole rom parts, only flash kernel within that ftf.
Gesendet von meinem Galaxy Nexus mit Tapatalk 2
Click to expand...
Click to collapse
and why should he flash only kernel??
sumitverma1 said:
If u from india then u can call me I can fix ur problem 9437256037. Just dwnld flashtool and firmware of neo l then flash it
Sent from my MT25i using xda premium
Click to expand...
Click to collapse
Kindly provide the giudance, I am not in India now.. Explain the steps how to do..
NSatya said:
Kindly provide the giudance, I am not in India now.. Explain the steps how to do..
Click to expand...
Click to collapse
it doesn't matters where you are... Download flashtool... Install it... Then you need a firmware file for your phone... Go to http://forum.xda-developers.com/showthread.php?t=2047914.. Download whichever firmware file you want... .587 is recommended... If you want you can have .631 also... after downloading the .ftf file, place it in firmwares folder of the flashtool installed folder... open flashtool.. Click on lightning icon.. It will ask 'flashmode' or 'fastboot'.. select flashmode... Then select the .ftf which you placed now.. Uncheck 'no final verification' option... Then connect your phone to the PC by holding the back button on ur phone... After the flashing is finished, switch on your phone... its done..
cherry676 said:
One last try you can give... Connect your phone to the charger and check if the led turns on.. Or else connect USB to the phone... While plugging it to the computer, hold the back button.... Check for the led light to turn GREEN... If this happens, then nothing wrong has happened to your phone.. Else no one can help you... PM me for further help..
Click to expand...
Click to collapse
I have the same situation here and i tried the above but the green led light is not turning on. Does it mean there is something wrong with my phone? I do need help with this asap. Thank you in advance!
ghennn said:
I have the same situation here and i tried the above but the green led light is not turning on. Does it mean there is something wrong with my phone? I do need help with this asap. Thank you in advance!
Click to expand...
Click to collapse
Switch off the phone.. Hold the "back" button and connect your phone to computer.. The LED should turn GREEN... It means that computer is recognising your phone.. Otherwise there might b some problem in the drivers or in the phone.. I cannot help you unless you can explain what you did before your phone entered into such state...
sony Xeperia neo L Mt 251 not turning on
sumitverma1 said:
If u from india then u can call me I can fix ur problem 9437256037. Just dwnld flashtool and firmware of neo l then flash it
Sent from my MT25i using xda premium
Click to expand...
Click to collapse
I have done as you said, LED light turned green... If there is no problem, y it is not getting switch on ?
I really appreciate your response.
svahmeds said:
I have done as you said, LED light turned green... If there is no problem, y it is not getting switch on ?
I really appreciate your response.
Click to expand...
Click to collapse
If LED is turning on, then its a good news that your phone is not dead. If nothing is getting displayed on the screen, then you might have fried up the internal circuitry. I have ended up with it. It cost me 25% of mobile's cost to get it repaired again.
i can't turn on my cell sony xeperia neo L mt251
cherry676 said:
If LED is turning on, then its a good news that your phone is not dead. If nothing is getting displayed on the screen, then you might have fried up the internal circuitry. I have ended up with it. It cost me 25% of mobile's cost to get it repaired again.
Click to expand...
Click to collapse
Hello
I can't turn my cell phone Sony Xeperia neo L MT251 please some on can help me
svahmeds said:
Hello
I can't turn my cell phone Sony Xeperia neo L MT251 please some on can help me
Click to expand...
Click to collapse
Flash a new ftf file. There is a guide for it. Phillip Wu's thread has all the steps. Go through the steps about flashing new stock firmware.
Xperia Neo L bricked ....
Hi All,
I think i have bricked my xperia neo l to a pretty bad shape.....Please help me ...
1)I rooted the phone sucessfully with the kit developed by DoomsLord
2)I installed the cwm recovery, took backup.
3)I did not flash the kernel but went ahead with the ICS revolution ROM Xperia NEO L:crying:
4)Installation of ICS went fine but the phone was stuck in the boot mode. Sony screen used to come and device used to boot......
Here is the stupid part..
5) I tried to go to recovery it didn`t work.. I thought maybe the kernel is a problem..I used the ICS kernel and flashed it.
Nothing works now...When i connect my cell to the laptop windows says device not recognized..I am trying to go to flashboot mode not working...Is there a way to fix it ? If yes please provide me any pointers...
mohans26 said:
Hi All,
I think i have bricked my xperia neo l to a pretty bad shape.....Please help me ...
1)I rooted the phone sucessfully with the kit developed by DoomsLord
2)I installed the cwm recovery, took backup.
3)I did not flash the kernel but went ahead with the ICS revolution ROM Xperia NEO L:crying:
4)Installation of ICS went fine but the phone was stuck in the boot mode. Sony screen used to come and device used to boot......
Here is the stupid part..
5) I tried to go to recovery it didn`t work.. I thought maybe the kernel is a problem..I used the ICS kernel and flashed it.
Nothing works now...When i connect my cell to the laptop windows says device not recognized..I am trying to go to flashboot mode not working...Is there a way to fix it ? If yes please provide me any pointers...
Click to expand...
Click to collapse
Dear friend.....
First,charge ur device at least 2hours....
When u charge ur phone,try to read carefully every step how install the custom rom u want....
After that...
-Flash full firmware via flashtool (flashmode)
Let ur phone on first...
And after ur phone works,its up to u maybe u want to continue another step to install custom rom u want....
But dont forget to flash the custom kernel recommended by the dev first before u do another step....
(flash custom kernel via fastboot)...
Hope it help and good luck.....
Sent from my MT25i using xda app-developers app
well..
Thanks for the advice ..But Windows is not recognizing the phone..When i try to flash and go into flash mode ..Pressing the back button and connecting..The flash tool says device not connected

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