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Please read this if you considering unlocking the boot loader or rooting your phone.
Please note that you may void the warranty of your phone and/or any warranty from your operator if you unlock the boot loader. You should only unlock the boot loader of your phone if you are an advanced user with good knowledge of the technology and risks involved.
For more information go here http://unlockbootloader.sonymobile.com/
Please also note
The Sony Xperia support team will not be able provide any support, related to unlocking the boot loader or rooting your phone.
We also recommend you to read the below blogposts.
Sony Xperia support team
2019-10-12 04:05 PM - edited 2019-10-14 10:49 AM
(I asked Sony Forum for the Xperia Z2 Forum for ask problems then wrote me that i can write here also)
I bought 2. hand Xperia Z2 with Masmallow updated, how its easyest/risk less way to downgrade to 4.4.4 (kitkat) thanks for the answers
2019-10-12 04:09 PM - edited 2019-10-12 04:09 PM
You have posted in the wrong forum...this is the Xperia 5 forum, not the Xperia Z2 forum..
Easy to get the 2 mixed up though!
2019-10-14 10:51 AM - edited 2019-10-14 10:55 AM
I asked to Sony "Forum for the Xperia Z2 Forum for ask problems" they wrote me that i can write here also...
if you cant help me, you dont must write to me...
or you can give me the link for Xperia Z2 forum then i will ask there you "smart aleck"
2019-10-14 01:00 PM
Unfortunately there is no official way to downgrade an Android version.. however you can try to flash the device but be warned it will void your warranty and remove DRM keys from your device. Head on to XDA FORUMS to know more
2019-10-14 03:58 PM
i used newer sony before this xperia z
for what is the drm keys importend?
the waranty is not importent becaause i bought it as (and over 3-4 jears used) 2.hand
today i showed from youtube and downgraded my (stock) 6.x xperia to (stock) 4.4.2
how can i control if the "drm" keyz gone or stay..? thanks for your kindly answer...
2019-10-14 06:24 PM - edited 2019-10-14 06:25 PM
If you don't know what the DRM keys are for, then you have a lot of reading to do.
Google them or READ THE INFORMATION AT THE TOP OF THIS TOPIC, before blindly flashing the phone, as some features will be removed permanently.