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..

[mdsuffian]

to flash to stock firmware i have to boot in flash mode ... i cant boot in flash mode... i'm stuck...

[chauhanjayc]

to boot into flash mode 

press - vol. key and if that is not responding you must be running empty battery 

if you have stuck boot look

keep and hold power key and master reset key(located under sim tray)

this way phone will turn off and all will be done

you can also use sony update services download here

which is specially design for phone who are not booting 

[mdsuffian]

my battery is charged at 100% i can boot my phone normally , i can also boot into fastboot , but the problem is i cant boot into flashmode..   

when i press the volume down key + power the led blinking green , red , no light...  same happen when i plug usb cable without holding volume down keys... 

i tried hold power key and master reset key , still same nothing happen...

i used sony update services it ask me to boot in flashmode... ( i cant boot in flashmode )

http://talk.sonymobile.com/t5/image/serverpage/image-id/15897i7A4951028E28EE2C/image-size/original?v...

im really stuck .. it seems everything need to boot in flash mode... 

can i send the phone to service center and ask them to upgrade my firmware ?

i know i already void the warranty by unlocking the boot loader , but im stuck at upgrading to new firmware / cant get latest update...

[chauhanjayc]

to boot into flash mod use vol - key not vol + key 

open any tool  you are using to flash when it says connect your phone in flash mode

turn off your phone completely 

wait untill you fell vibretion and then press vol - (vol down key) no other key and then connect 

[mdsuffian]

i used volume down key (Vol - ) as mentioned in the PC companion tool but still cant boot into flash mode.

i tried force shutdown by holding powerbutton and volume up , after the three times vibrate it completely shutdown , i leave for about 10 second to make sure it completely shutdown. after complete shutdown i tried holding volume down (no other key) while plugin the cable , still no luck. the LED blink green , red , no LED.

[chauhanjayc]

remember one thing 

there is no led either green red or any color in flash mod

so there wod be no led in flash mod if you connect flsh mod

so after connecting wait for some time

and if you are on unlocked bootloader then try use flash tool

dowbload ftf and flash thru flash tool

[mdsuffian]

i tried connecting while holding volume down button it keeps blinking red , green , off..   but i can boot into fastboot normally which when i hold volume up button the LED turns blue...

this is the message log from flashtoolkit when i connect while holding volume down button  :

26/002/2014 17:02:52 - INFO  - (MainSWT.java:152) - Device connected with USB debugging off
26/002/2014 17:02:52 - INFO  - (MainSWT.java:153) - For 2011 devices line, be sure you are not in MTP mode

this is the message log from flashtoolkit when i connect while my phone is on :

26/015/2014 17:15:47 - INFO  - (MainSWT.java:135) - Device connected with USB debugging on
26/015/2014 17:15:48 - INFO  - (MainSWT.java:990) - Connected device : Sony Xperia T2 Ultra
26/015/2014 17:15:48 - INFO  - (MainSWT.java:997) - Installed version of busybox : BusyBox v1.22.1-Stericson (2014-01-25 17:27:18 CET) multi-call binary.
26/015/2014 17:15:48 - INFO  - (MainSWT.java:998) - Android version : 4.3 / kernel version : 3.4.0+ / Build number : 19.0.1.A.0.207
26/015/2014 17:15:48 - INFO  - (MainSWT.java:1012) - Checking root access
26/015/2014 17:15:49 - INFO  - (MainSWT.java:1076) - Root Access Allowed

this is the message log from flashtoolkit when i connect while holding volume up :

 26/017/2014 17:17:31 - INFO  - (MainSWT.java:148) - Device connected in fastboot mode

this is the message log from flashtoolkit when i connect without any key :

26/020/2014 17:20:56 - INFO  - (MainSWT.java:152) - Device connected with USB debugging off
26/020/2014 17:20:56 - INFO  - (MainSWT.java:153) - For 2011 devices line, be sure you are not in MTP mode

+ im using SEMC driver from flashtoolkit the installation was all success...

[chauhanjayc]

what was the states of your phone while you got that log

was it turn off or on

this is the message log from flashtoolkit when i connect while holding volume up :

 26/017/2014 17:17:31 - INFO  - (MainSWT.java:148) - Device connected in fastboot mode

this is the message log from flashtoolkit when i connect without any key :

26/020/2014 17:20:56 - INFO  - (MainSWT.java:152) - Device connected with USB debugging off
26/020/2014 17:20:56 - INFO  - (MainSWT.java:153) - For 2011 devices line, be sure you are not in MTP mode

+ im using SEMC driver from flashtoolkit the installation was all success...

it should be turn off complatly 

check this out how to use flash tool

[mdsuffian]

it is completly turned off.

i tried the other way to update my firmware , system setting -> about -> system update . but i got this error after reboot :

E:Invalid command argument
Finding update package...
E:unknown volume for path [/storage/emulated/0/recovery/update_package]
E:Can't mount /storage/emulated/0/recovery/update_package
Installation aborted.

any idea ?

[Zann_H]

i will say this again. you need to unlock your bootleader again then flash stock firmware. once that is done, then you can relock your bootloader and update.

you are having issues right now because your kernel is not stock when you relock.