Hello friends. I think I found the solution after searching here in the forum. Has to do with the validity of application certificates. Many that I usually install are outdated certificates. Using aegis hack(http://talk.maemo.org/showthread.php?t=90750) solve the problem. But it has a simpler way that also solves by simply changing the phone date to a few years ago. An example application that is impossible to install is the Reboot (https://openrepos.net/content/kamengatalica/reboot). Test with today's date(can not install without the aegis hack) and then try to put the year 2015 that will work(even without installing the aegis hack)