HTC Desire 616 hard-bricked (dead) after format all + download in sp falsh tool
The dead state of a smartphone is actually because of corrupted firmware files.
either the rom your are flashing is corrupted or the flashing process is interrupted whatever is the problem. try flashing with some other flashing tool and make sure you are flashing the right rom for your smartphone...

and about factory logo and imei no. factory logo is inbuilt in the rom your are flashing if it is official..and for the imei all android roms have modem binaries which are responsible for networking and imei related operations..

Can you tell me about your smartphone.?