This article describes the step by step recovery method for a Digi One IA or a Digi One SP. Users will only need to do this if the Digi unit power light is blinking in a 9-1-1 pattern. This pattern means the firmware is corrupt or invalid. This typically only happens when a user loads a new firmware and forgets to update the POST first.
Following this guide, users will enter the Digi One SPs or IAs diagnostics menu and load a previous firmware version to get their device back to a working state. To use this guide you will need to get your previous version of firmware (ftp://ftp1.digi.com/support/firmware) and a tftp server. If you do not have a tftp application you may use the Digi tftp application located here: ftp://ftp1.digi.com/support/utilities/tftpd.exe. To use this application put the binary firmware image in the same directory as the tftp executable and then double click on the tftpd.exe executable to start the tftp service.
To enter the Diagnostics menu on the Digi One you will need to make sure you have a null modem cable between your PC and the Digi One as well as an Ethernet network connection.
The first thing you will do is open a hyper terminal session (or another terminal application such as PuTTy for Windows 7 and later) to that COM port (typically COM1) at 9600 baud, 8 data bits, no parity, 1 stop bit, and no flow control. Once the port is open make sure to leave the focus on the hyper terminal / terminal application window.
In the next step you will need to locate the reset switch, please see the image below for where to look for the reset switch on a Digi One IA. Depending on which version of the IA you have it will either be a round switch (in plain view), or looking to where the pen is pointing to on the lower device is a small white switch.
The reset button on the Digi One SP is located underneath the unit next to the small dip switches. Be careful not to pucture it with sharp instruments.
The next part can be tricky, and you may wish to get a partner to assist you. First you must un-plug the power to the device, wait one moment, then plug the power back into the device. Once you see the power light flash once, press and hold the reset switch. While you hold the reset switch press the v (lower case v) key once every few seconds on your keyboard until the diagnostics menu appears in the window. The diagnostics menu may take up to a minute and a half to appear. Once it appears, you will see the menu scroll by a number of times
When the diagnostics menu stops scrolling by you will want to press C (shift c) to tftp a new image into the firmware. You will then be asked for the image name and this will include the .bin extension. Next you will be asked for a temporary IP address for the unit, a submask, and a gateway. Then you will need to enter the IP address for the tftp server (or your PC running the tftp service). Finally you will be asked to confirm the information you have entered. Once confirmed the Digi One will attempt to download the firmware image via tftp from your tftp server.
The Digi One SP Diagnostics menu is different:
If it is successful the current firmware on your unit will be erased, and the firmware you have downloaded will be written to flash. Once the Digi One has finished writing the firmware to flash (this will take a few minutes) it will attempt to start up using the new firmware image. If successful the power light will come on solid (will no longer blink in the 9-1-1 pattern) and you will be able to communicate with the device and load the current POST, and then reload your new firmware image. Please note that the above firmware file name is an example. The actual firmware file name may have an additional 0 or a different letter revision.