Thanks for your reply. Do as you say, still failure, message is same as above. I have tried to use one notebook boot from PC running netinstall 4.17, and netinstall could see the notebook. So there is nothing wrong with my PC and my setting. But RB133 can't boot into netinstall with this PC. Perhaps...

I have one RB133, after i format it in Boot Menu, can't boot it into netinstall. RouterBOOT booter 2.19 RouterBoard 133 CPU frequency: 175 MHz Memory size: 32 MB Press any key within 6 seconds to enter setup...... kernel not found trying bootp protocol... OK Got IP address: 192.168.7.10 resolved mac...

Did anyone install routeros on rb133 through serial sucessfully?

COELPL, could you give me more detail ?