Wrong signature

[yuri4]

Hello guys. I am trying to downgrade with the downloaded firmware but it says wrong signature. Can you help?

 

[Sense]

Please try using a different USB-Stick

 

[yuri4]

I used another usb stick and i have the same message

 

[Sense]

And you are sure you are using the correct image ?

Maybe try and do a complete reset of the box before downgrade ?

 

[yuri4]

Can you help me how to completely reset the box?