How to flash stock OS Kindle Fire 1st Gen

[mordecai305]

Hi,
I currently have a Kindle Fire 1st Gen with no OS Installed. FireFireFire and TWRP are both installed but TWRP can not open. I have been trying to fix my kindle for about a week and a half and i'm going to lose it soon.

I would like to know how to flash the stock rom in Fastboot mode. I have the rom and files all here but I don't know how to install.

Thanks in Advance

 

[mordecai305]

Anyone? I need this soon