Device hardbricked

HI all.

I was having cwm recovery and cm12 rom in yureka..... i decded to roll it back to kitkat but ended in soft brick......to get recover from that i tried so many ways and in 1 site they asked me to do below steps

fastboot -i 0x1ebf oem unlock
fastboot -i 0x1ebf erase modem
fastboot -i 0x1ebf erase boot
fastboot -i 0x1ebf erase recovery
fastboot -i 0x1ebf erase aboot
fastboot -i 0x1ebf erase abootbak
fastboot -i 0x1ebf erase hyp
fastboot -i 0x1ebf erase hypbak
fastboot -i 0x1ebf erase rpm
fastboot -i 0x1ebf erase rpmbak
fastboot -i 0x1ebf erase sbl1
fastboot -i 0x1ebf erase sbl1bak
fastboot -i 0x1ebf erase tz
fastboot -i 0x1ebf erase tzbak
fastboot -i 0x1ebf format system
fastboot -i 0x1ebf format userdata
fastboot -i 0x1ebf format cache

i stuck in this step fastboot -i 0x1ebf flash modem NON-HLOS.bin and the phone powered off and not powering on both in recovery mode nor in fast boot please help me out.........:crying::crying::crying: