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Q3Q4: What to do if you find the 2.4G Wi-Fi is not stable when use Raspberry Pi 4 with expansion board(like X825/X857/X872) connected by USB3 connector?
X872
,3. You can also power via the X872 DC 5V IN port only(must use high quality PSU), but 2pin power cable to connect X872 and Pi 4 are not provided, you need to prepare the 2pin power cable your self.