Got mine last week. Installed yesterday, early 2011 MBP 13 on Catalina, interesting bug is happening. When the module is connected, the system goes nuts, all fans high speed, system throttles itself like overheating (kernel_task to 96% cpu) become unusable. Tried reset smc and pram, no dice. Disconnect module, it works fine, reconnect bugs again. Anyone else experience this? Is it a kext conflict, maybe bad solder?
Did you boot into safe mode? We wouldn't have shipped it untested with bad solder.
There's an interesting post on StackExchange that mentions a Catalina Wi-Fi driver bug and a fix: https://apple.stackexchange.com/a/375600
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