How to update my samsung galaxy tab 4 to android lollipop

Guys please i want some help! I am trying to update my samsung galaxy tab 4 tablet to lollipop but i don't know how . At first i thought the update will come as a notification. I waited for lots of months but the update is yet to come! Do you have any ideas or possible solutions? Please let me know as soon as possible! Thank you for reading this thread.

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