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I want to upgrade the SSD on my MacBook Air, but is that possible

Yes, you can replace the SSD in a 2017 model MacBook Air. The socketed PCIe SSD that fits Late 2013-Early 2017 MacBook Airs will also fit Late 2013-Mid 2015 MacBook Pros. If you’re shopping on the used market, be sure to get a 4x card, which is the speed your computer is designed to use. Pre-2015 laptops use a slower 2x card; it will work in your system, but you’re throwing speed away. iFixit sells both recycled Apple SSDs and new replacements from OtherWorld Computing: MacBook Air 11" (2013-2015) 13" (2013-2017) MacBook Pro Retina 13" and 15" (2015) SSD[linked product missing or disabled: IF123-123-1] iFixit doesn’t have any guides for the 2017 MacBook Air, but it’s basically just a speed bump of the earlier Early 2015 MacBook Air. Most of the repair guides for the 2015 model should work with the 2017 model, as long as you use the replacement parts for the newer model: MacBook Air 13" Early 2015 SSD Replacement The 2017 MBA is the most recent Apple laptop with a socketed drive. All the Thunderbolt 3/USB-C era MacBook Pros (2016 and newer)/MacBook Airs (2018 and newer) have the storage modules soldered to the logic board; storage upgrades will require unsoldering the stock storage chips and replacement with larger ones, which is a pretty big hurdle. Prices for all these SSDs have fallen sharply over the last few months. My suspicion is that aftermarket manufacturers like OWC are trying to sell as many of these as they can, while machines that can use them are still working :-/

you cannot change your macbook ssd by yourself,you have to contact apple support in your country in order to change your laptop battery,make sure it is authorized apple center.