Hayden James from Pinstack.com has figured out a way to install BlackBerry OS 4.1 on 71xx series and 72xx series BlackBerry devices. This installation is only about 7 steps and takes roughly 20 minutes but understand that this procedure is not supported by Pinstack.com.
You can find the Install instructions here…
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{ 1 comment… read it below or add one }
Don’t upgrade your 72XX to 4.1 unless you have an official version from your carrier! All sorts of important functions break! This is a case where having the latest and greatest, is not in fact the greatest. I tried it and I say skip it.