Thanks. Could you check whether b43 module (b43.ko) is found in your initrd? Run lsinitrd. ----you can list lsinitrdgr------- You can try to unload b43 once, and load again: modprobe -r b43 modprobe b43 ---- after , modprobe -r b43 & modprobe b43 , I can use wifi ------ The problem is solved, but how to modify the initialization sequence to include the modification? thanks