[Q] upgrading firmware but unlocked bootloader - Xperia Z2 Q&A, Help & Troubleshooting

hi,
I started this thread:
http://forum.xda-developers.com/xperia-z2/help/upgrading-55-to-314-t2860394
but ran into an issue. Since I didn't get any updates on that thread, I thought I would make a post dedicated to the problem I'm running into.
basically while attempting to upgrade to .314 using PC Companion I get
The phone tablet contains modified software that cannot be updated
Sony Updated Engine failure (error 2003)
Click to expand...
Click to collapse
with some research it appears that this is because i unlocked my bootloader.
Questions:
is my conclusion correct? or is this because of something else?
if correct, what is the recommended course of action here? relock bootloader and update using companion PC or decrypt FTF files and flash using flashtool?
If i relock bootloader using flashtool, will it wipe my phone data?
I've found the firmware files on my computer (C:\ProgramData\Sony Mobile\Update Engine\db\13740270\blob_fs) If i decrypt these with flashtool and use them to update firmware, will it wipe my data?
Thanks

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You can update via flashtool without looking data. Flash ftf file and check system only and uncheck wipe. Re- locking bootloader will wipe your phone. Your assumption is correct m8. You can't update your phone with pc companion because of your unlocked bootloader. Happy flashing m8
Sent from my D6503 using xda premium from "Somewhere, but not here..."

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stress40 said:
You can update via flashtool without looking data. Flash ftf file and check system only and uncheck wipe. Re- locking bootloader will wipe your phone. Your assumption is correct m8. You can't update your phone with pc companion because of your unlocked bootloader. Happy flashing m8
Sent from my D6503 using xda premium from "Somewhere, but not here..."
Click to expand...
Click to collapse
Hey! thanks for the help on this subject.
I wonder where I can find official tft for sony z2 (314). I'm in exact same position as [w]. Want to upgrade the software (stock) but I already unlockd bootloader and flashed stock kernel with recovery. Sony software says that can update the phone, but I don't want to download som strange tft. Want the oficial tft image or some goo source.
Thanks again
hope you have a nice day

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deftoner said:
Hey! thanks for the help on this subject.
I wonder where I can find official tft for sony z2 (314). I'm in exact same position as [w]. Want to upgrade the software (stock) but I already unlockd bootloader and flashed stock kernel with recovery. Sony software says that can update the phone, but I don't want to download som strange tft. Want the oficial tft image or some goo source.
Thanks again
hope you have a nice day
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?t=2759934
here you can find all the ftf files

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Envious_Data said:
http://forum.xda-developers.com/showthread.php?t=2759934
here you can find all the ftf files
Click to expand...
Click to collapse
I swear that I use the search! thanks Envious_Data!
have a good one.

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deftoner said:
I swear that I use the search! thanks Envious_Data!
have a good one.
Click to expand...
Click to collapse
there is a help forum at the top of qna, try advertising that to people as there are links to many useful things there such as that thread with all the ftfs
that frf thread is also found at the top of the general section

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deftoner said:
Hey! thanks for the help on this subject.
I wonder where I can find official tft for sony z2 (314). I'm in exact same position as [w]. Want to upgrade the software (stock) but I already unlockd bootloader and flashed stock kernel with recovery. Sony software says that can update the phone, but I don't want to download som strange tft. Want the oficial tft image or some goo source.
Click to expand...
Click to collapse
I'm also kinda paranoid so I just created my own FTF from official Sony update via Sony PC Companion using these instructions.
http://talk.sonymobile.com/t5/Xperi...eria/This-is-how-to-create-an-FTF/td-p/228703
Its takes a while but felt more comfortable than just some random dl.
here is the .314 i created.
https://mega.co.nz/#!vFxxxBIC!jhyxhfGIqxJxycY-6vCHU4Vai-gkmyBiNGgAZLhlp8U

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stress40 said:
You can update via flashtool without looking data. Flash ftf file and check system only and uncheck wipe.
Click to expand...
Click to collapse
So i'm a little paranoid, can you explain like i'm 5?
attached is a screenshot of the flashtool interface
What do i want to check and what do i want to leve unchecked?
do you mean that all the check boxes under WIPE should be empty
and the only checkbox under EXCLUDE that should be checked is SYSTEM?
thanks

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@[w] Hey m8, Here's a step by step guide with videos from xperiafirmware hope it helps. BTW did you re-lock your bootloader?

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stress40 said:
@[w] Hey m8, Here's a step by step guide with videos from xperiafirmware hope it helps. BTW did you re-lock your bootloader?
Click to expand...
Click to collapse
sweet. upgraded and rooted using "Easy Root Tool" (was super easy!) :good:
for others discovering this post i've attached a screenshot of what my flashmode tool looked like:
basically under WIPE make sure DATA is unchecked. you will notice that userdata.sin disappears from content list
under exclude make sure nothing is checked.
win.

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@[w] Hey m8, glad to see everything went ok Now you are all set to go and mod to your heart's content:highfive: Thanks for posting the screen shot and explanation as a reference for noobs/Sh*tsung refugees to see how the Flashtool screen should look during upgrading. Once again thanks for that:victory: