Download latest firmware for the iolan+ from this software downloads link: http://www.perle.com/downloads/server_iolan+.shtml

Copy the iolan+ firmware file to the desktop on your computer.

After the Pumpkin TFTP software is installed, start it up from Programs/Accessories/Klever Co.

Select "Options".  Configure the following:  

For the TFTP filesystem root, click on the browse button to the right of the TFTP filesystem root (download path) and select the Desktop.

For the Read Request Behaviour, select "Give all files".

For the Write Request Behaviour, select "Take all files".

Select "Apply" then "OK" to accept changes.

Leave the PumpKIN TFTP program open on your computer.

Telnet into the IOLAN's Server menu or access it through the Serial port. In the Server menu screen make the following changes:

In the "Boot host" field, enter the TFTP Server’s IP address.

Press the Enter key to Save and exit the Server menu screen.

Select the Reboot option and press the space bar to reboot the IOLAN+.

When the IOLAN+ reboots, it will attempt to get the firmware file from your WIndows TFTP Server and reprogram its internal flash and reboot itself.

Method 2:  upgrading from the Bootstrap menu

Make sure that your TFTP server can ping the IP address of the IOLAN+.  Power OFF your IOLAN+.  Use a serial Terminal or a Windows PC running the Hyperterminal Program. The communication settings need to be 9600 baud, 8 data bits, 1 stop, none parity, xon/xoff flow. Connect the Terminal or the PC to Port 1 on the IOLAN+. Leave the Hyperterminal Program session open.

If your iolan+ has a 10MB ethernet interface only, do the following:

On the rear of the IOLAN+ is a black plastic cap covering a hole. Remove it to expose a hole with a miniature switch inside.  Use a paper clip or sharp pencil or pen to depress and hold in the switch.  Power on the IOLAN+ but continue holding the switch until the bootstrap menu appears on the terminal screen. Continue with the option selections below.

If your iolan+ has a 10 / 100MB ethernert interface, do the following:

Power ON the IOLAN+, hold the CTL (control) key and while holding the CTL press the B key 5 times. You should see the Bootstrap menu appear. If not, repeat the control sequence again as it is timing sensitive. When the bootstrap menu appears, continue with the option selections below. 

Option selections

Select option 4. Download.

Select option 2. Ethernet interface.

You will see the following prompt: The terminal server ethernet address is currently - xx:xx:xx:xx:xx:xx

Do you wish to change this? (n) Note: The ethernet address must match the ethernet address located on the label on the botton of the IOLAN+. If it matches, then do not change it. Press Enter to continue.

You will see the following prompt: The Server IP address is currently: xxx.xxx.xxx.xxx

Do you wish to change this? (n) Note: This is the IOLAN+ IP address. If it matches then do not change it. Press Enter to continue.

Then you will see the following prompt: Enter download host IP address: Here you need to enter the IP address of your computer. Press the Enter key to continue.

Lastly, press the enter key to begin downloading the IOLAN+ firmware file. This will take a few minutes.