The notebook, as usual, doesn’t have a dedicated service cover but the bottom piece comes off easily making it super easy to access the upgradeable hardware.

1. Removing the bottom piece

You just need to unscrew the bottom plate and will see all the usual upgrade options – M.2 SSD, 2.5-inch HDD, RAM chips, Wi-Fi card and battery. The cooling system is also pretty easy to maintain.

2. Storage

As expected, the laptop offers a standard 2.5-inch HDD and M.2 PCIe NVMe SSD slot. The 2.5-inch drive in our case is manufactured by Seagate and offers the usual 1TB capacity while the M.2 SSD stick is a PCIe NVMe SK Hynix HFS512GD9MND5 (2280) with 512GB capacity.
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https://laptopmedia.com/highlights/inside-lenovo-legion-y520-disassembly-internal-photos-and-upgrade-options/