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old code. Then, after the code has been downgraded, the device can be logged in from
the console or by Telnet, but not SSH. The SSH authentication details will need to be reset.
If no backup configuration has been saved but it is still possible to access the device
management via some method while running the old code (e.g. Console, Telnet or SSH),
then you can redefine all the device management passwords as required.
If after a downgrade it is impossible to login to the device via any method, then there are
two ways to recover the router:
From the BOOT menu, set the new code to run again and reboot the device.
Disable Telnet authentication:
a. User-interface vty 0 4
b. Authentication mode none
c. Then save the configuration and downgrade the code again, login via Telnet
and reset all the passwords as required.
From the BOOT menu. On boot-up, use Ctrl+B to enter the Boot menu and then
force the unit to use the factory default configuration (bypassing the user
configuration). The unit will then need to be fully reconfigured.
List of resolved problems
Resolved Problems in CMW520-R2318
RTD066297
Symptom: The total of NAT servers for each interface is 256 and needs to be enlarged
to 1024.
Condition: None
RTD066325
Symptom: The MIB OID of hh3cCBQoSClassMatchedPackets for the dialer interface
can't get the value.
Condition: None
RTD066837
Symptom: When the two 3G interfaces switch, the NAT data can't switch to active
interface automatically, and the old NAT session in the NAT table still exist.
Condition: The main interface and backup interface are also 3G interface at the
router, and the two 3G interface set NAT function.
RTD066566
Symptom: The router reboots abnormally.
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