Take all the screws out and then begin separating along the tiny seam between the two hinges (I found this to be the easiest place to start).
There are two different storage M.2 types that can fit into these Lenovo computers due to the socket they chose to install. Unfortunately these computers will only work with one of the types.[br]
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They put in a socket that CAN TAKE an X4 (4 lane) NVMe M.2 SSD, but this computer will NOT work with one![br]
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Instead you need to buy an M.2 SATA X2 (two lane) SSD. You can spot the difference by looking at the number of key notches (B+M) in the card edge connector of the SSD. You need one with TWO notches, not just one (M-only), even though an NVMe X4 SSD (that only has the one notch) can fit in the socket.[br]
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=== Update (02/10/2020) ===
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Oops, might have been mistaken here: I have an N22, which is different inside than an N23. That said there still might be a connector for this, just in a more hidden place so it might be worth taking a look.
These things ARE upgradable!
There is a tiny unused M.2 SSD connector inside!
Take all the screws out and then begin separating along the tiny seam between the two hinges (I found this to be the easiest place to start).
There are two different storage M.2 types that can fit into these Lenovo computers due to the socket they chose to install. Unfortunately these computers will only work with one of the types.[br]
They put in a socket that CAN TAKE an X4 (4 lane) NVMe M.2 SSD, but this computer will NOT work with one![br]
Instead you need to buy an M.2 SATA X2 (two lane) SSD. You can spot the difference by looking at the number of key notches (B+M) in the card edge connector of the SSD. You need one with TWO notches, not just one (M-only), even though an NVMe X4 SSD (that only has the one notch) can fit in the socket.[br]