Owner's Manual

RouterBOARD 411AR Series User's Manual
Boot Loader Upgrading
The boot loader is needed to initialize all the hardware and boot the system up. Newer loader versions might
have support for more hardware, so it's generally a good idea to upgrade the loader once a newer version is
available. You can upgrade the loader through the onboard serial port using XModem protocol (programs
available for all major OSs). For example, you can use HyperTerminal for Windows or Minicom for Linux to
upload the boot loader. Alternatively if you have a DHCP/BOOTP and TFTP servers available, you can specify
the loader image as a boot image and choose the bios upgrade over ethernet option in the boot loader
configuration menu. The loader will get the image from the TFTP server and upgrade itself. The most current
loader image is available for download on www.routerboard.com.
The boot loader upgrading is supported also from MikroTik RouterOS. The procedure is described in the
MikroTik RouterOS manual.
Serial Null-modem (Console) Cable with Loopback
DB9f Function DB9f DB25f
1 + 4 + 6 CD + DTR + DSR N/C N/C
N/C CD + DTR + DSR 1 + 4 + 6 6 + 8 + 20
2 RxD 3 2
3 TxD 2 3
5 GND 5 7
7 + 8 RTS + CTS N/C N/C
N/C RTS + CTS 7 + 8 4 + 5
8