Ok, your bootloader is still unlocked correct? Then for flashing the boot.img, you are booting into bootloader, then choosing fastboot, first check to be sure device is seen in fastboot. Type
fastboot devices <and hit enter>
This should show you your device S/N.
fastboot flash boot boot.img <and hit enter>
The boot.img has to be in the same folder you have fastboot.exe in also.
Hope this helps!
I followed blackrose guid to update hboot after the update the hboot version was 1.0 then i switch off the mobile and tried to reboot it but then no response from the device, now if i connect charger or usb cable the notification light turn into red and keep blinking,i think i have briked the device