Hi,
I need a help, please!
A router of a friend of mine, was working fully good for a year a go, and he calls me a few days ago and me and told me that the wifi isn’t working!
I can conect to the router using winbox and ssh!
The 5 ethernet ports are working good!
I cand see and configure anything but not wifi, because the 2 wifi interfaces, one of 2.4Ghz and the other of 5 Ghz; does not appear on the interfaces list!!!
I had perform a hard reset and the problem persist!
Then I had perform a NetInstall and it had finished successfully and the wifi interfaces does not appear!!!
It looks like a hardware problem, like if some component on the PCB is not working and does not feed with electric current the wifi chip.
I’m not an hardware expert, but I can do some fix, if someone held me a hand 
Thanks in advance!
Best regards,
Eliecer