You should set tftp server current directory that means tftp access default directory to your file location.if you set it , "/ " is correct file path.thanks,

Hi>Radio1 not started, not enough POE power>Radio0 not started, not enough POE poweryou need more power source to enable radio.

Hi(Cisco Controller) >show advanced 802.11a channel

That's fine.you have 2 option 1. disable DHCP Proxy to passthrough client dhcp packet to mikrotik.2. WLC debug dhcp packet to see exchange of DHCP packets to isolate the problem.

Telnet to AP port 443 means connection test for https.Can you do it?