Plz help. Iphone 5 not working after update

[Hollywood]

My iphone 5 was jailboke on ios 6.1.3 I backed up to my Mac and all and tried to update to IOS 7. Now all my ip5 is saying showing the plug into iTunes. Itunes is saying it is in recovery mode. When I click restore and update iPhone, I get an error message saying, "The iPhone "iPhone" could not be restored. This device isn't eligible for the requested build. How can I fix this? I got to have a phone. I send and recieve multiple important messages a day on my phone for job. I am a teacher and high school coach, so my phone is important. Plz help me fix this or am I just screwed?

 

[Hollywood]

I have also use TinyUmbrella to kick it out of recovery mode and it goes right back into it.