I want to update my MacBook Air 13-Inch, Model A1466, Part No. MMGG2LL/A. How do I do it?

Have done some research to determine near exact model you've got there.

With exception of any built year custom options; so I could see what's up:

Appears RAM is fixed at time of manufacture. SSD may not be upgraded by user.

Choices of CPU or GPU - were to have been done at time of purchase.

Your MacBook Air may be capable of system upgrade a later stable/final version

of Catalina macOS 10.15.7+ (or -if supported- retail release of 'Big Sur' macOS11.x)

..This, what was found.. mostly in MacTracker database; plus info I'd located..

Details lacking w/o Lookup specs, include CPU i5 or i7, among other

• MacBook Air (13-inch, Early 2015)

Introduced March 2015

Discontinued June 2017

Model Identifier MacBookAir7,2

Model Number A1466

EMC 2925

Order Number(s) MJVE2LL/A, MMGF2LL/A (128 GB storage),

MJVG2LL/A, MMGG2LL/A (256 GB storage -- or 512 GB, BTO)

(Had to identify further to see what could be upgraded in

Software ~ and see if any Hardware upgrade is possible.)

None of system hardware specs have 'end-user' upgrades.

Good luck & happy computing!🐌|🐢