After successfully updating to firmware 2.1 using a custom firmware downloaded from ispazio.net, I started to install applications from Appstore and soon afterwards I installed the most important applications from Cydia: AppBackup, AptBackup and biteSMS. Before installing any app from Cydia, all apps from AppStore (Spore, BrainChall) started up with no problems, but soon after installing biteSMS, NO app from...