Huawei Quidway AR 28 Series Installation Manual page 97

Quidway AR 28 Series Routers Installation Manual Chapter 7 Troubleshooting
Solution:
AR 28 Series Routers 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.
Note:
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.
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