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Hello, Can i upgrade my Ram from 4 GB to 8 GB plz i need a answer.

Sadly No, The RAM is soldered to the logic board and is not upgradable. Your only choice here is to exchange the logic board with one that has 8 GB which is not economical. It would be cheaper to buy a new system. Review this IFIXIT teardown: MacBook Air 13" Mid 2011 Teardown. Jump to Step 13. The red outlined chips are the RAM chips.