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Hello, I’m just intrested of a opinion, if you can upgrade the stats? I know, that changing the motherboard is a big job, but if that is only way, then how long would it take?

There is only one upgrade option here, and thats the SSD, to a larger one if your current one is running tight. OWC Aura Pro X2 SSD following this guide: [MacBook Air 11" Mid 2013 SSD Replacement|