[Q] upgrading from .55 to .314 - Xperia Z2 Q&A, Help & Troubleshooting

so i'm looking to upgrade from .55 to .314
am in canada and got fone from sony store.
I unlocked bootloader and rooted.
I found this thread:
http://forum.xda-developers.com/xperia-z2/help/upgrade-root-to-314-firmware-t2837941
and want to confirm that what i want to do is the following:
backup
update to .314 from PC companion
reroot using xperiarootkit - http://forum.xda-developers.com/showthread.php?t=2559009
Install dual recovery http://forum.xda-developers.com/showthread.php?t=2261606
Questions:
Where do i download rootkitXperia_20140719.zip from? not obvious from that page
Anything else of interest I might want to be aware of?
Thanks

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[w] said:
Questions:
Where do i download rootkitXperia_20140719.zip from? not obvious from that page
Anything else of interest I might want to be aware of?
Thanks
Click to expand...
Click to collapse
I'm suggesting an alternative to rootkitXperia. I use Easy Root Tool. Search for this in the Cross-Device Development Projects for Sony Devices. It works in Windows and Linux.
Sent from my SGP311 using XDA Free mobile app

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You can also find links in the all you need to know thread in Q&A section m8:thumbup:
Sent from my D6503 using xda premium from "Somewhere, but not here..."

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got around to doing this today but i've run into an issue.
The phone tablet contains modified software that cannot be updated
Sony Updated Engine failure (error 2003)
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What to do? :crying:
thx
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update:
it seems this is because i unlocked my bootloader.
Questions:
- 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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[w] said:
got around to doing this today but i've run into an issue.
The phone tablet contains modified software that cannot be updated
Sony Updated Engine failure (error 2003)
View attachment 2920914
What to do? :crying:
thx
------------------------------------------------------------------------------------
update:
it seems this is because i unlocked my bootloader.
Questions:
- 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
Click to expand...
Click to collapse
I'm on exactly same problem.
I have Xperia z2 from usa (factory unlocked). I'm on stopck rom, rooted, backed up the ta, unlocked bootloader.
I flashed Doom Kernel (stock) for the recovery. Nothing more flashed.
I was waiting for stock kernel for 314 before update. Now is available I try to update using the sony software and it says that "The phone tablet contains modified software that cannot be updated"
I really dont want to flash tft using flashtool, I don't find any official sony page for the ftf and I don't like to flash "NN" tft floating on the net.
Any ideas?
thanks for the time!
If I found a solution I will post it here.

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@[w] @deftoner Well you have 2 options. You can repair phone via pc companion (after relocking bootloader and restoring TA) then re root (you don't need to unlock bootloader unless you are going to flash a custom kernel or rom that requires an unlocked bootloader) or you can use flashtool to upgrade. Using flashtool; you need to download the ftf file you want then just flash system only, skipping kernel. If you want to keep data then untick wipe. As always do a backup first. You can also find more information from here Here is a link for flashtool. Good luck guys:good: Happy reading/flashing:highfive:
Edit: all links from XDA

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stress40 said:
@[w] @deftoner Well you have 2 options. You can repair phone via pc companion (after relocking bootloader and restoring TA) then re root (you don't need to unlock bootloader unless you are going to flash a custom kernel or rom that requires an unlocked bootloader) or you can use flashtool to upgrade. Using flashtool; you need to download the ftf file you want then just flash system only, skipping kernel. If you want to keep data then untick wipe. As always do a backup first. You can also find more information from here Here is a link for flashtool. Good luck guys:good: Happy reading/flashing:highfive:
Edit: all links from XDA
Click to expand...
Click to collapse
Thanks for the clear reply stress40. I already flashed using flashtool, flashed doomkernel and re rooted the phone.
Thanks again!
hope you have a nice day

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for reference. i was able to successfully upgrade to .314
here's the other thread i started specifically around flashing with unlocked bootloader.
http://forum.xda-developers.com/xpe...are-unlocked-bootloader-t2866758#post55285530