****HOW TO DOWNGRADE BBM TO 6.2.0.44(BLACKBERRY CURVE 8520)
1.BACKUP ALL THE CONTACT(Using BlackBerry Protect or Email.)
2.BORN A NEW CURVED 8520(STANDARD)
3.NOT RESPONSIBLE ANY LOSING DATA(BUT IS SAFE

)
STEPS:-
MENU>OPTION>SECURITY>SECURITY WIPE>Mark the USER INSTALLED APPLICATONS(REMEMBER ALL APPLICATION YOU HAVE LOADED WILL BE REMOVED!!)>make sure that the MEDIA CARD UNTICK!!(unless you wanna format it)>than type the password given(blackberry)>then WIPE
Then,
After complete wipe..:-
1.Check your App world(Still installed O not)
2.If not installed yet:-
I.Confirm Your Data Connection (Wifi or Blackberry Data Plan thats you Applied)
II.if you guys using BIS,just Continued if not/using Wifi connection pls use this method:-
1.BROWSER>open the Menu button>go to OPTION>BROWSER CONFIGURATION >change the browser type to HOTSPOT BROWSER.>also changed the GENERAL PROPERTIES>DEFAULT BROWSER to HOTSPOT BROWSER>then SAVE.
2.If u guys want to subscribe the BIS just changed the BROWSER CONFIGURATION & GENERAL PROPERTIES to your guys DATA PLAN.(E.G. for my plan is DIGI WAP).DONE!
3.Now open your BBM(it will automatically pop up a Licensed & Agreement,just click Yes,then it will ask you to Upgrade A new Version...Just click NO...your BBM Version will be 6.2.0.44.

4.Download BB Protect(use to Back UP n Restore Data)(Or You guys can Restore From the E-mail[more easier])

5.CREATE YOUR E-MAIL ON YOUR BB
I.go to SETUP>SETUP WIZARD>E-MAIL SETUP(MAKE SURE you guys got the ENTERPRISE ACTIVITION PASSWORD from BLACKBERRY ENTERPRISE SERVER...=)
6.SIGN IN YOR BB ID.
7.There you Done it...any Q'tion?...just ask me...

..
>>>GOOD LUCK!!!!!!!!<<<