[Q] Samsung Galaxy SII won't reboot after root attempt.. plz help

My brother brought his samsung Galaxy SII and he decided to give it to me.
he lives in australia and i am from india.
he had his connection by Yes Optus. Yesterday i Tried to root my phone using Odin.
everything worked fine. I used the following steps:

Odin showed PASS sign and my phone tried to reboot but it showed the startup screen with a yellow triangle beneath. And then nothing has happened since. please help me and tell what did i do wrong?

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