Some server may not update just yet so you can play on those.
However your client side must be the same version of the server you want to play on.
Rollback Post to RevisionRollBack
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that sucks. I cant update cause all of my mods.
You can downgrade using this if you want to join 1.5.2 servers and play on 1.5.1 mods (Its legit)
http://www.minecraft...gradable-sound/
However your client side must be the same version of the server you want to play on.