How do i update my blackberry 9500 storm (originally vodafone carrier) to OS 5.0?

PamGueco

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Hi. I currently own a 9500 storm. It's original carrier is vodafone but it's already openline. Since I'm from the Philippines, I use Globe as my sim card.

Now here's the thing, my phone's current OS is v4.7.0. I accidentally updated my Blackberry Messenger app to the latest version, which is only compatible to OS v 5.0. now, i can't use my BBM :( can anybody pls help me??? i wanna upgrade my OS or downgrade my BBM. Please and thanks!
 
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