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I’ve got HP 15-bs100ur laptop. There is Realtec rtl8723de WiFi/Bluetooth adapter installed. But there is no official support with GNU/Linux, only self-written drivers, where Bluetooth still not working. Is it possible to replace installed adapter with another one, which has GNU/Linux support? Are there any pitfalls, like BIOS software lock or anything like it?

In my experience as long as the supported card has the correct connection to install to the laptop’s motherboard, youll be fine. I have replaced wifi cards before. Most HP 15 models I have come across are user replaceable.