What firmware version digicap.dav did you offer in the same directory as the TFTP server executable for the TFTP transfer, and what firmware version is printed on the camera label?
And how did you 'brick' it? By loading older firmware for a 2015 manufacture camera, or by changing some values in mtdblock5 or 6?
Are you using the TFTP server that says 'Hikvison TFTP server' in the title? That works best.