what to do after rooting my phone..?

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http://androidforums.com – i own a A87...i rooted this phone...plz tell me what to delete n what not to delete from dis divice after rooting... i rooted my device earlier n deleted some files due to which it went dead... bt i ws lucky enuf to hav my phone replaced under DOA... so please help me dis time so tha i dont delete any filed which harms my phone...i will also b thankful if anyone could tell me abt d pros n cons of rooting ur phone... (General)