Something like putting it in fastboot and open a command prompt, now here's to hoping you have basic command line experience. I would recommend putting the images you downloaded into for instance the same folded as the fastboot command in SRT, or if you have another fastboot command that is fine as well. Idme if SRT defaultly put its images in the same folder as fastboot, but if it did feel free to deleted them to avoid confusion. Anyways for the commands, CD into the directory containing the fastboot commands that you placed your images in. Now I believe this is what you want to run:
Code:
fastboot -i 0x1949 flash boot stock-boot.IMG
Fastboot -i 0x1949 flash system stock-system.IMG
Fastboot -i 0x1949 flash recovery stock-recovery.IMG
Note that I am not positive on the file names but if it was incorrect just change the name in the command of the IMG file as it needs be. Wouldn't recommend flashing the bootloader unless you have to, bad bootloader flashes a hard bricks so I avoid flashing it unless absolutely necessary, and also note boot is not bootloader, boot is the kernel+intramfs. Also don't flash the boot0block image at all. That contains that persons serial number, Mac address and other info, idk why he put it in there, its kinda personal.
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