Undo upgrade w/o root?

[KentG]

Is there any way to undo the latest upgrade 17.1.2.A.0.314?

After reading all posts I may have to undo the upgrade and return to the previous version (17.1.1.A.0.402)

Regards

[Uliwooly]

download the FTF file, then use flashtool 

[KentG]

Doesn't that invalidate the warranty?

I was thinking more of an official way perhaps through the PC Companion... 

[Thommo]

There is so such way via PCC to downgrade it has to be done via Flashtools as said above by Uli

[HussainQuadri]

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@KentG wrote:

Doesn't that invalidate the warranty?

I was thinking more of an official way perhaps through the PC Companion... 

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It shouldn't void warranty. Just find the correct one for your location.

Make a backup of your internal storage though (wiping data partition wipes internal storage as well).