Solved! Laptop in which installing M.2 will not void warranty.

Apr 17, 2018
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So I've been wondering if there is any laptop that gives possiblity to add additional SSD M.2 PCIe that will not void the warranty?
 
Solution
I have been buying Lenovo Thinkpads for years, they are very easily serviceable and I always still get warranty service even after DIY upgrades.