Upgrading IE on Mobile device

I have some older IPaq's that have IE installed.  I can't find a way to see what version it is running, but it looks different that the IE on the newer devices.  How can I upgrade the version of IE without having to do a full OS upgrade (no longer available on these devices)?  I have tried to find either an IE Mobile 6 download or an IE Mobile 6 Upgrade download.  No luck.  I am trying not to have to use a different browser as our application is written for IE and Chrome, Opera, etc won't work as cleanly.
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You cannot upgrade the IE. Its embedded into the rom.

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