You can’t. The eMMC and RAM is soldered to the board on the Stream and the vast majority of these “$35 Windows license” laptops. Some of them use modular parts, but they’re not easy to come by since these are configured to make beancounters happy. Part of the reason they have horrible onboard storage because it’s their way to sell OneDrive storage — they aren’t even hiding it this time. This article goes into the problem.
Save your time, skip the cloud storage. Get a 128GB MicroSD card and take this as a lesson on why you need to do some basic research first. If the eMMC ever dies, you’re replacing the computer since the motherboard IS the SSD.
The issue with value on these is you can do better with an older business laptop, but they do not give you a free year of Office 365 — the specs do not qualify it for the subsidized subscription. If you wanted to match the size, a 12” business laptop with 8-16GB of RAM and a ULV processor will run circles around these for similar money if you can get a good deal on one. Some of them like the E6220/30 even have full fat embedded processors, but they will not run Win11, so I do not recommend them unless the machine is super cheap. The other thing is you want one with an SSD out of the box even if it’s the 128GB LiteOn SSD Dell used for a few years or a SK Hynix AHCI M.2 SSD you can change later.
This is your “SSD” and RAM in these laptops:
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