The second step to improve the blackberry if blank

a few days ago I've shared with you about how to deal with blackberries suddenly blank ,whether you have succeeded in this way?if you fail, please do as below:Wipe Blackberry -> Wipe bb it is his hard reset blackberry , but before doing Wipe, back up your data first on his blackberry.1. BB data back upConnect BB to the laptop / PC via Desktop Manager (DM), then select "back up & restore". Select