01-20-2019 07:27 AM - edited 01-20-2019 07:29 AM
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Per psref. RAM is soldered so not upgradeable.
The drive is replaceable see below HMM(hardware maintenance manual) page 34
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T490, TP 25 Retro, X1 Yoga 3rd Gen, W510 850 EVO, A30p
Retired 385D, A20p, A21p