HELLO
I HAVE A PROBLEM WITH MY RouterBOARD 750 WHEN I CREAT THE HOTSPOT ON LAN AND THE WIRELLES WHEN A NEW CLIENT IS CONNECTED IT SAYS ERROR 404: NOT FOUND CAN SOMEONE HELP ME PLEASE

No need to type in all caps.
Check /files. Are you your hotspot files there? If not, you can try to reset the html with /ip hotspot reset-html