When upgrading a SPA525G2 from older firmware such as 7.4.4 or 7.5.x [yes, 7.5.x is older than 7.4.6 firmware] to 7.4.6 the upgrade may fail and you may notice messages similar to the following in syslog output [if you enabled debug or syslog]
"SPA525G <MAC address> -- Upgrade failed: upgrade not allowed, version constraint"
"SPA525G <MAC address> -- Upgrade failed: upgrade to less than rev not allowed"
Overcoming this issue is a 3-step process as follows:
- upgrade the SPA525G2 to spa525g-P01.bin
[retrieve file from here:
https://skydrive.live.com/redir.aspx?cid=d4a0ae1d2799d6ff&resid=D4A0AE1D2799D6FF!268&authkey=DhJHvQC79aI%24 ]
- upgrade the SPA525G2 to 7.4.6 or newer, available from Cisco.com
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