יצאו עדכוני אבטחה לא עדכונים רגילים.
תנסה לעשות ריסט לקאש בדרך זו (שום דבר לא ימחק, רק תעשה זאת בדיוק ובזהירות):
https://www.youtube.com/watch?v=YCYRIAOCUrE
Clearing the Cache Partition:
 
NOTE: if your smartphone is not working properly and you're thinking about master resetting it, then you might want to try and clear the cache first. By doing so, you can avoid the deletion of personal data stored on your phone's internal memory. Unlike when you apply a master reset, clearing the cache will not result in personal data loss.
 
Power off your smartphone
Press and hold "Volume up", "Home" and "Power" at the same time
After the phone vibrates, release the "Power" button but continue to hold "Volume Up" and "home"
Once the "Android System Recovery" screen appears, release all the hardware buttons
Using the "Volume Down" button, navigate to and highlight "wipe cache partition"
Press "Power" to select the option
Once the cache partition has been wiped, "Reboot System Now" should be highlighted
Press the "Power" key to reboot your device
 
NOTE: if clearing the cache didn't help, then you might have to reset your device. To do so, please visit this link for a full guide on how to factory reset the SGS5 using the settings menu or hardware buttons.
 
Read more:
http://cellphoneforums.net/samsung-...tition-rebooting-safe-mode.html#ixzz4EfxoxZZK