[Q] Reverting back to Stock rom

Hi guys...i hav installed Cyanogen mod 10.2 on my Note n700 Using Cyanogen installer . but due to some problems i want to reverting back to it's
stock rom ..so guys could to tell me the best n safe process of reverting back to it's Stock rom..but there is one another problem ... there some yellow triangle on start screen ,,hope it;s not harmful for process...so please help me :\