Help Galaxy S2 stuck on welcome screen

[Hanounn]

Hello I own a galaxy S2 running android ISC unrooted
the battery died once and when I recharged it and turned it back on it wouldnt go past the welcome screen.
I am able to go into recovery mode and download mode. I tried to backup my data through ADB but it did not work since the device wont start up (the device was recognized as in recovery)
does anyone have a solution on how to backup my data (pictures are most important!) or will a factory reset help and without rooting?
Thanks

 

[garbam]

Hey! I had the same problem but I long pressed the up volume button, home button and power button then I did backup and restore then factory resetted it and recalibrated my battery but it still randomly turns off at times but I hope my info helps!

 

[immortalneo]

Doing a factory reset won't delete your photos, videos, songs, documents, etc. It will only delete your apps, their data, contacts, call log, sms, mms, calendar, notes, memo etc.

You can also try rooting and taking a nandroid backup. That should backup everything in your internal SD card.