iPhone Stuck at apple logo..Help!!

hi;

i have recently jailbroken(absinthe) my iphone 4s IOS 5.1 and downloaded a few themes and application which i do not want to lose. My phone crushed when i was trying to install Whatsapp.IPa application through iFunbox, it will just boot to the apple log and hangs in there...i tried to connect to iTunes and iTunes will freeze..i can only access its files through ifunbox but i dont really know what i am suppose to do to fix this issue.

Pliz help.
lovely, botswana.

my regards

 

Holmes093

i tried that with ifunbox a couples of tyms and i failed... it cant find the whatsapp file..infact the phone will connect to ifunbox for few minutes and disconnect b4 it could finish to seach for the files... so i searched all the files one by one and i couldn't find the file...the phone could not restore with iTunes too, it gives the following error message and disconnect ""the iphone "name" could not be restored.an unknown error occured(-50).