I either do it, but i BBM it has a problem with this bbm current version 2.0.025. Because i try to hard reset my phone i got preinstalled bbm version 1.x.x.xx already ( thats has no sticker yet i'm forget the exact version), i am successfully logged in , and im updated it with current version of bbm, and it work. but dont reinstalled, just update it, because it won't bring the login screen up. So that's The only thing we can do right now with bbm, my windows phone firmware is Lumia 730 dual sim apac, indonesia.
Also my tips is , install tecnical preview from wp 8.1 and update with gdr 1 & 2, and then to WP 10 TP.