Why Windows Phone Recovery Tool won't downgrade my Lumia?

[Sebastian Larrea]

I recently updated my Lumia 630 (Admitted) to Windows 10 TP but now i want to go back to Cyan/Denim. The thing is that both Windows Phone Recovery Tool and Lumia Software Recovery Tool gave me an error.
The WPRT recognize my Lumia but when is "Reading phone information" it says Unknow error ocurred...

Value Cannot Be Null.
Parameter Name: string

Don't know what to do to downgrade! Maybe it's the PC not the phone?
Thanks in advance!!

 

[Alain_A]

I recently updated my Lumia 630 (Admitted) to Windows 10 TP but now i want to go back to Cyan/Denim. The thing is that both Windows Phone Recovery Tool and Lumia Software Recovery Tool gave me an error.
The WPRT recognize my Lumia but when is "Reading phone information" it says Unknow error ocurred...

Value Cannot Be Null.
Parameter Name: string

Don't know what to do to downgrade! Maybe it's the PC not the phone?
Thanks in advance!!

are doing that with windows 10 tech preview??? if yes try with a pc that has 8.1