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Solution to my Thinkpad E16 Wi-Fi Woes
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I have P14s. I simply replaced the wifi card with an Intel AX200. Problem solved!
A lot of the modern thinkpads have the wifi module soldered to the motherboard nowadays unfortunately. Sad that they would use these crappy realtek cards in the first place as well.
According to the repair manual, my Wi-Fi card is actually replaceable, at least physically. I don’t know if Lenovo still does BIOS whitelists of cards like they used to (I think they did remove it a few years back.), but their OEM parts website has a diverse selection if this fix were ever to break.
I’d say other than the bottom being a bother to remove (and the keyboard not being designed to be replaced, though after some research, it seems possible), this is a surprisingly repairable laptop for how recent it it. It has dual SSD bays and a DIMM slot.
Oh that's good then. I think they stopped using whitelists a while ago, so if it is slotted you can probably replace it with anything. Maybe they reversed course on soldered modules then, or perhaps it only applied to some models. I looked into specs of the T16 at some point, and that one had soldered wifi module.