upgrade ucs 2.1 to 3.x

hello,

 

i want to upgrade the UCS from 2.1 relase os to latest version, is there any harm to doing this ? will the upgrade needs some path prequsist(2.1 to 2.2 and then ..... to 3.x).

can i have any reference document for doing this.

 

 

thanks,

 

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