Interesting, can you please elaborate? There is a boot selection menu as you can see below, but there are no other visible prompts at boot. I have so far been unable to load any new code (including the preinstalled image) on the unit using XMODEM or the "copy" command in the Cisco style CLI. When using XMODEM, the transfer has been stalling and stopping with no error about halfway through the transfer, and I am getting a file write error when using the copy command to load an image from tftp.did you try putty with flow control disabled (!!) and intercept the 3 second boot-up? Most VXworks have the same bootloader with function 30 backdoor built in.
Boot Menu Version: 28 Apr 2008 Calculating CRC of active image...done... Select an option. If no selection in 2 seconds then operational code will start. 1 - Start operational code. 2 - Start Boot Menu. Select (1, 2):2 Options available 1 - Start operational code 2 - Change baud rate 3 - Retrieve event log using XMODEM 4 - Load new operational code using XMODEM 5 - Load configuration using XMODEM 6 - Display operational code vital product data 7 - Update boot code 8 - Delete operational code 9 - Reset the system 10 - Restore configuration to factory defaults (delete config files) 11 - Activate Backup Image 12 - Run Diagnostics Image 13 - Load new Diagnostics Image using XMODEM [Boot Menu]