Cannot update to new firmware on sony xperia T2 Ultra Single Sim ( Cannot boot into flashmode)

[mdsuffian]

i try to update my phone to new firmware using PC companion . the update stuck when it ask for reboot to flashmode which asking me to turn off the phone plugin usb cable to pc and while holding volume down key insert another end of usb cable to the phone. i tried holding down the button + volume up for few seconds until 3x vibrates ,  and do the plugin usb cable while holding volume down button , but still it cannot recognize my phone....on device manager, i saw  new device with name SOMC flash device , and it working correctly.. i dont know why my device cant start in flashmode ... i also tried downloading emma , still my device is not recognised / not detected ...   i also have tried using flashtool to flash the firmware but still no luck stuck at same screen waiting for device in flash mode... i try removed sd card and do plugin while holding volume down button still the screen says waiting for device in flashmode..

[ujjal]

from where you get this instruction.

[Uliwooly]

Try SUS instead, if that doesn't work then try a different PC

Update Service (SUS)

PC Companion (PCC)

Bridge (for Mac)

Alternatives on How to backup Xperias

http://talk.sonymobile.com/thread/36355

By the way, have you unlocked your bootloader?

[mdsuffian]

same... it stuck on same screen ( flashmode) .... i tried 3 different computer still same result.. it doesnt continue when asking to connect to flashmode... on PC Companion also stuck whe ask to connect in flash mode...

[Uliwooly]

I can't see the picture until its approved by a moderator, have you unlocked the bootloader?

[mdsuffian]

yes i already unlocked the bootloader and using the doomlord guide ( http://forum.xda-developers.com/showthread.php?t=2685932 ) to root. is the unlocked bootloader cause me to unable to boot flashmode ?

http://postimg.org/image/bcqr7alen/  link to image i post earlier

[Uliwooly]

You need to relock the bootloader if you want to use SUS, PCC, Bridge, etc 

[Zann_H]

Before u relock, flash stock firmware first. If not u will ahve issues.

[mdsuffian]

the problem is to flash back to stock firmware or relock i also have to get into flashmode which currently i cannot get into it...   is it possible to restore to stock firmware without using flashmode... i can boot into fastboot but not flashmode..

this is a sample instruction i got to relock bootloader :

5. how to relock your bootloader
a) download and install latest Flashtool from here (mirrors One Drive or Mega)
b) start Flashtool and click on BLU button on the top
c) turn off your phone and when Flashtool shows pop up window, connect phone to PC with holding volume down button
d) just click on relock button and your bootloader is locked for now

the step C ask me to  holding volume down button while connect to phone which is flashmode ... im in a same problem it seems everything must have to boot into flashmode...    the only thing i can do is flash img file with fastboot using flashtoolkit ..

i have the stock firmware .ftf but i still have to boot in flashmode to flash the ftf firmware...

i have this problem even since i use the stock default  with locked bootloader...

the only thing i do to root my phone is unlock bootloader thru fastboot and flash boot.img using fastboot flash img to get root...

is there any way of fixing my phone flashmode without having to go into flash mode    .... im really stuck ...

The update is going smooth with downloading checking etc. but i stuck on this part ( flashmode)  , see screenshot:

and when i check my device manager everytime i plugin my device it shows SOMC flash device detected:

is it because i use the wrong driver ? or it is not related with the driver.... * i try update and change the driver to semc flash device but still same... other pc also detect as semc / somc ...

and when trying with flashtoolkit it says my device connected with usb debugging off... is it normal ?

SUS also having same problem , it goes smoothly until it ask to boot into flashmode..

[Zann_H]

Did ul flash stock firmware before you relock? This is important.

If you have already relock your firmware, then you will need to unlock again and flash stock firmware. Then relock again.