Not sure if you are following the directions correctly. Do you have the document from quintum on reformatting the flash? There are 2 steps that must be done before you type ftp;
From the document:
1. Press and hold both the Diag and Reset buttons, then release Reset and continue to hold Diag until the unit boots to the Tenor prompt.
2. Type the command ‘er 32 2’ to reformat the flash.
3. At the Tenor prompt, type ‘ftp -c’ to assign a temporary IP address to the unit.
If you have seen and done this and are still getting an error, then the software version you have may have may not support this.