URGENT help required. BBM7 missing after OS upgrade! :(

Dear BB friends and helpers!

I urgently require your help. I have seen some similar topics posted but none exactly the same as mine so I would really really appreciate if anyone can very kindly help me out.

I have a major problem on the Blackberry Bold 9900.

A few days ago I updated my Blackberry Messanger (BBM only) to BBM7. Everything was working fine.
Then last night I got a message on my phone to upgrade my operating system to OS 7 which I installed.
Then this morning I noticed that my BBM has disappeared from my phone and I can't find it.
I currently have 7.1.0 Bundle 2061

(Also note that BB App world wont give me the option to download BBM and trying to download other apps also freezes the app world)

I have already tried

1) Hard reset / battery pull
and
2) Doing a universal search and looking for hidden icons.

I have seen a few other similar topics but I wanted to ask what I should do... :

1) Re-install BBM7 from a link from this forum? or
2) Downgrade OS7 to OS 6 via Options - Software Updates - Downgrade?

Or any other options?

The KEY thing is that I do not lose my BBM contacts! That is the end goal of whatever is recommended. I really hope someone can help.

Many thanks in advance,

Kind Regards,
Michael

No worries,
loosing BBM is normal " in my case though" :)
using your mobile browser, go to
BlackBerry Wallpapers, Ringtones, and More and look for BBM download.

try connection desktop manager and under the apps tab, search for bbm and install it from there

I would suggest a re-install from app world.

Sent from my BlackBerry 9930 using Tapatalk