I have found a problem with WIFI mac adress as with Tenbay T-MB5-EU-v01
if you build add lines in -> ramips/mt7621/base-files/etc/hotplug.d/ieee80211/10_fix_wifi_mac
just after **case "$board" in **
cudy,x6)
hw_mac_addr="$(mtd_get_mac_binary factory 0x4)"
[ "$PHYNBR" = "0" ] && macaddr_add $hw_mac_addr "2" > /sys${DEVPATH}/macaddress
[ "$PHYNBR" = "1" ] && macaddr_add $hw_mac_addr "3" > /sys${DEVPATH}/macaddress
;;
With the patch WIFI MacAdress are lan + 2 for 2.4GHz & lan + 3 for 5 Ghz
Many thanks solved by [blocktrron] Developer