Downgrading firmware without unlocking.

Hello,
1. How can I downgrade the firmware version _without_ unlocking the device?
2. Does it break the warranty if I unlock my phone only to downgrade the firmware?
3. How can I relock the device once it is unlocked? Does Emma have this feature?
Thank you

Why do you want to downgrade your phone? You can use flashtool, as for the warranty, it could this is how
How to manually update, downgrade, root 2013 Xperias
http://talk.sonymobile.com/thread/124152
"I'd rather be hated for who I am, than loved for who I am not." Kurt Cobain (1967-1994)

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