Sonicwall Pro 2040 Enhanced, upgrading firmware

Has anyone had any problem upgrading firmware on Sonicwall 2040 Enhanced?  Mysonicwall shows latest is 4.2.1.4-7e. Currently I have 4.0....
I had some problem last time upgrading firmware last time, so I'm not sure if upgrading firmware has any problem I have to be prepared.
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crcsupportAsked:
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carlmdConnect With a Mentor Commented:
Normally no. If their could be an issue, read the notes accompanying the release.

Be sure to make a backup or your current confguration before upgrading.
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