3Com 3C13751 Getting Started Manual page 54

54 Chapter 4: Troubleshooting
Upgrade the application software again after the problem is solved.
Fault 2: When upgrading the software using the TFTP approach, and
the system displays the following message:
Loading...
NET download completed...
read len = [05567609]
The downloaded software is not a valid version.
Please download the correct version.
Press <Enter> key when ready.
Troubleshooting The Router 5000 should be loaded with different
application software versions. The problem described above is likely to
result from a mismatch between the application software version and the
router model. In this case, contact your agent to obtain the correct
software version and upgrade it again.
If the improper software has been loaded, the Router cannot start or
work correctly. In this case, select XModem or TFTP mode in the boot
menu to restore/upgrade the software version (FTP upgrade mode cannot
be used here).
If similar symptoms present when upgrading the software with other
approaches, solve the problem with reference to this example.
The bar code labeled on the Router host and the MIM contains the
relevant manufacturing and maintenance information. If you want to
repair the device, inform your agent of the bar code on the problem
device.