XPERIA U cannot get into fastboot mode, unlocking bootloader - Sony Xperia P, U, Sola, Go

Hi all,
My XPERIA U cannot get into fastboot mode even though I plugged the USB cable with holding down Volume Up Button.
I also tried it with holding down Volume Down Button.
I cannot have the bootloader unlocked.
My XPERIA U says its bootloader is allowed to be unlocked, and it is SIM free.
Please give me an advise to me!!
Thanks!

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kantagon said:
Hi all,
My XPERIA U cannot get into fastboot mode even though I plugged the USB cable with holding down Volume Up Button.
I also tried it with holding down Volume Down Button.
I cannot have the bootloader unlocked.
My XPERIA U says its bootloader is allowed to be unlocked, and it is SIM free.
Please give me an advise to me!!
Thanks!
Click to expand...
Click to collapse
Same problem here
Anyway I try downloading flashtool and in the driver folder ( inside flashtool folder) there is an installer try install it when there are check box check them all and install
After that fastboot mode should be working
This is the easiest way to install fastboot driver, I think
It works for me
Sent from my LT26i using xda premium

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Just get the flashtool from here:
http://androxyde.github.com/
Install it (make sure you disable your antivirus while downloading).
Open C:\Flashtool\drivers and install the drivers.
Its the easiest way as Theonlyzii mentioned.

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Theres workaround in general forum.
You must FAST!
Open device manager first
When you plugged in ur device with fast boot mode there should be a new driver detected on device manager,. Right click and update driver( you must fast before its disappear). After you succesfully install the driver now you can reconnect ur device in fastboot mode.
Hope this help. You might want to search that workaround im talking about for clearer instruction.
Sent from my ST25i using xda premium

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Nah mate...
I had failed. Windows just couldn't find the right drivers from doomlord's thread
Anyway, flashtool is the easiest, and pain free method.
Sent from my ST25i using xda premium

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Thanks all!!
Finally I could succeed unlocking the bootloader with the way of installing the driver from flashtool that you advised me!
I was not able to this method on my Windows8 RP PC, and I did not find the reason why I cannot. And I succeeded this on another Windows 7 PC! Thanks to you, I could notice that.
And for you, ankh.red,
I was trying it many times because my Xperia U turn off the blue LED soon(around 3 seconds). But it was always failing detecting any driver after I catch my Xperia U on the Device Manager. Of cource I had a driver from Sony's official page.
I think windows8 will need some change to do this. I have found on web someone who succeeded it on Windows8...
Anyway, I was helped by you! Thank you!! I will search next interesting things on the rooted from now!
Sent from my ST25i using xda app-developers app

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Yeah I have the same problem before... Blue LED 3 sec,
I have to install the fastboot driver ( not the Sony one but the one in fastboot USB folder) before it disappear on devices manager..
Anyway, I glad you're able to unlock your bootloader now .
Happy rooting lol
Sent from my ST25i using xda premium

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I had this problem too before. But i installed flashtool it works!

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Elwino2.3 said:
I had this problem too before. But i installed flashtool it works!
Click to expand...
Click to collapse
Im glad to help
Sent from my LT26i using xda premium

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I think my problem was something on windows8. I want to find it out because I go abroad to study soon and I bring only windows8...
Sent from my ST25i using xda app-developers app

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Dont wanna start another thread so im just going ask here:
1. Why the speaker is so quite or is it just me?!
2. How can i root without unlocking bootloader since i dont wanna loose drm files( did they even important?! )
3. If there be some forum just for xperia U/P or we need to post in this ection....
P.S. previousely iv had xperia x8 so im new with this xperia, and sorry if this questions are already answered....

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1. Enable xLoud in Settings>Sound
2. Not yet possible. I believe DRM is some protection given to music files bought legally. I think you might not be able to play such files (correct me if I'm wrong)
3. Not yet. Many have requested mods. No seperate sections
Sent from my ST25i using xda premium

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any other source for flashtool? those hosting sites are testing my patience. download to around 40MB then suddenly transfers get to zero then have to repeat. others let wait endlessly.

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jtdc said:
any other source for flashtool? those hosting sites are testing my patience. download to around 40MB then suddenly transfers get to zero then have to repeat. others let wait endlessly.
Click to expand...
Click to collapse
It will be old version but works
Go to filestube.com than search flashtool and in left pan from options of files sharing site select mediafire here you go http://www.mediafire.com/?5htqv01u4vci91q
Sent from my ST25i using xda premium

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thank you sir. perhaps someone can upload the latest one to a more useful temporary upload site, like yousendit perhaps? i am trying that older version though... i just need it for the drivers due to the fastboot won't activate the driver search and the XperiaU just continues to charge instead of remaining in fastboot.

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jtdc said:
thank you sir. perhaps someone can upload the latest one to a more useful temporary upload site, like yousendit perhaps? i am trying that older version though... i just need it for the drivers due to the fastboot won't activate the driver search and the XperiaU just continues to charge instead of remaining in fastboot.
Click to expand...
Click to collapse
Hey drivers will be in the folder of flashtool isntall from that definitely it will work because I use this version only there are minor updates
Sent from my ST25i using xda premium

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yep, the drivers within the older version did work

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Theonlyzii said:
Same problem here
Anyway I try downloading flashtool and in the driver folder ( inside flashtool folder) there is an installer try install it when there are check box check them all and install
After that fastboot mode should be working
This is the easiest way to install fastboot driver, I think
It works for me
Sent from my LT26i using xda premium
Click to expand...
Click to collapse
little help needed
can i use this flashtool method on stock ics?
wen i will install drivers from flashtool folder should my phone be connected or not??
if yes den in which mode?

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Utkarsh-ezzo said:
little help needed
can i use this flashtool method on stock ics?
wen i will install drivers from flashtool folder should my phone be connected or not??
if yes den in which mode?
Click to expand...
Click to collapse
Yes you can use on stock ics and drivers can be installed without phone connection
Sent from my ST25i using Tapatalk 2

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For Windows 8 users. The drivers cannot be installed because of the driver signature enforcement.
This is how to disable it.
First, press win + I to launch the charm bar, and click Change PC Settings at the bottom.
Then, go to General, and scroll to the bottom of the page, click Restart Now button under Advanced Startup section.
The computer reboots to a startup menu, in which click Troubleshoot.
And click Advanced Options at next screen.
Choose Startup Settings next And click Restart button.
The computer reboots and prompts another menu to choose. One of the items is to Disable driver signature enforcement. Press number 7 or F7 to continue booting to Windows 8 with digital sign enforcement disabled.
Hope that helps