[Q] Coolpad F2 (8675-W00) BRICKED? Image Signature Verify Fail topic

Hello everyone,

First time here and completely lost with my Coolpad F2.
Tried to flash recovery this way it is described here:

movilesdualsim.com_tema_coolpad-f2-cambiar-recovery-cmw.88858

sorry, cannot put the link to the outside page yet

but after restarting the phone I got the message:

Image signature verify fail

and the start-up logo of the F2. Pretty much this is it, the phone turns off. I can't get into the recovery either as it shows the same message each time I want to turn it on. I guess it's bricked somehow and I must have done something wrong with the tutorial.

Does anybody have any idea how do tackle it?
If some more information is needed just let me know - I'm completely new to this and don't exactly feel there can be a cure for that.

thanks.