can't update my phone, why? - Sony Xperia M2

hello,
my phone is M2 Dual D2302 4.4.4 rooted with kingroot. but i am unable to update to 5.1.1 i tried both OTA and PC.
on OTA after downloading the update and install it the phone restart and say can't install.
and On PC companion the update start then stop because internet stopped for a short time, and then PC companion says: Phone / Tablet software update information currently not accessible.
what is the reason and how i can update the phone ?

hafezs said:
hello,
my phone is M2 Dual D2302 4.4.4 rooted with kingroot. but i am unable to update to 5.1.1 i tried both OTA and PC.
on OTA after downloading the update and install it the phone restart and say can't install.
and On PC companion the update start then stop because internet stopped for a short time, and then PC companion says: Phone / Tablet software update information currently not accessible.
what is the reason and how i can update the phone ?
Click to expand...
Click to collapse
If your bootloader is unlocked, you can't update via OTA.

You'll need tui flash ftf via flashtool once it's available on Sony servers updates don't work once rooted or your bootloader is unlocked
D2303 rooted+deodexed, 5.1 de-bloated customised NCB, NUT t2u dual recovery, xposed, bravia engine,x-reality,supervivid

thanks for you replies
the bootloader is locked.
but the phone is rooted, is this the reason ?

hafezs said:
thanks for you replies
the bootloader is locked.
but the phone is rooted, is this the reason ?
Click to expand...
Click to collapse
Yes
Sent from my D2303 using Tapatalk

thanks, i used flashtool to flash FTF.

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update using OTA or Sony PC companion software.
My phone is flashed with pre rooted stock so i cant update ota
sourabhp said:
update using OTA or Sony PC companion software.[/QUOTEMy phone is flashed with pre rooted stock so i cant update ota
Click to expand...
Click to collapse
ralphgreg said:
sourabhp said:
update using OTA or Sony PC companion software.[/QUOTEMy phone is flashed with pre rooted stock so i cant update ota
Click to expand...
Click to collapse
If its stock firmware u can use OTA unless you have uninstalled update service software.
Else download XperiFirm_4.7.3_(by_Igor_Eisberg) software. from this, download the firmware for your phone model and create ftf using latest flashtool then flash it using flashtool
Click to expand...
Click to collapse
Ok. Thank you

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