Can't start my phone (galaxy s2) after rooting atempt

Hello guys.

Because of not enough space for installing apps, i was searching for rooting my android phone. I tried a lot of different ways to do this and the last one i tried was with Odin, connecting my phone through usb cable.

Now i can't start my phone, on screen i have a yellow triangle with an exclamation mark and i can't do anything.

I can acces Recovery menu (VOL-UP + home + power).

Please help me to start my phone someway...now i really dont care about root or anything, i just want my phone like it was.

Thanks in advance and sorry for my bad english.

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Can't start my phone (galaxy s2) after rooting atempt