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How do I downgrade WP 10 Technical Preview to WP 8.1?

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Windows Central Question

how i downgrade wp 10 tehinical preview to wp 8.1?

i ve tried to downgrade to wp 8.1 but i can?t.i ve got error with meesage: software indisponibil for your phone on server.my phone is a lumia 920 singapore country variant! pls helm me! i ve tried with nokia recovery tool and lumia recovery tool.


Retired Ambassador
Sep 26, 2014
Re: how i downgrade wp 10 tehinical preview to wp 8.1?

Probably the contact between your phone and your PC is not perfect.
Try to use a different USB cable or a different USB ports.

If you need more assistance please register and reply on this post.


New member
May 29, 2014
With the Lumia recovery tool, choose my phone won't turn turn on then plug in the USB cable. If the firmware is already on the pc and the phone is switched on, it will be set to flash mode before downgrading begins.