Lenovo e490 is a cheaper and less performant alternative to the famous T series.
The laptop came to me with a deformed box but I decided to give it a try and so far so good.
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I have bought a basic version and upgraded RAM for it. Here are some photos about disassembly process.
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To open the case one hast to unscrew several screws and accurately open the flexible cover using some non-sharp tool (like guitar pick).
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Internals:
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Internals with added memory plane:
There is also an empty ssd slot that is filled with a plastic placeholder:
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How to replace battery / Disassembly
Video: