I am working with a wifi card, the EEPROM reports country->regdmn code 0x3a, which should be "US".
I have already update the /lib/firmware images
# file /lib/firmware/regulatory*
firmware/crda/regulatory-2016-06-10-1.bin: CRDA wireless regulatory database file (Version 1)
firmware/crda/regulatory.bin: CRDA wireless regulatory database file (Version 1)
firmware/crda/regulatory.db: CRDA wireless regulatory database file
firmware/crda/regulatory.db.p7s: data
regulatory.db and egulatory.db.p7s are "2019-06-03"
the kernel 5.4 complains this
cfg80211: loaded regulatory.db is malformed or signature is missing/invalid
any idea?