Xbox 360 says play DVD :'(

Hello guys im new here and my xbox 360 is having an annoying fault here is the story.

Yesterday i started my xbox i got fifa 12 ORIGINAL from a friend and when i plugged it in it said something like you need to update your console,
as i dont have any internet cable connected to it i just pressed yes.
And now i have a new menu and thats fine for me but now i have a really big problem.
My backup games wont play any more it says play dvd everytime
i have a liteon drive and it has been FLASHED
what is changed could it be fifa thats making this trouble or can it be a coincidence that this is happening?
Can anyone help me out there? WHAT TO DO??:(

Your drive may be back to stock fw. You'll need to reflash the drive.

that was the same thought that i had i will see if i can get it done for free i have paid him once for the flash :D i cant do it myself without special tools can i ? :)

Nope, you need a x360usb pro to connect the drive to your pc if you don't have a compatible sata chipset and a few things more. There's a tutorial for slims here, you might want to check it out