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you can try use itunes! mange the photos!
appleios.jpg
 
Settings:General:Usage:photos and Camera

You can swipe to delete like in most lists on the phone.
 
In iTunes, check or un-check the box for syncing photos. It'll ask whether to keep or remove all photos on the phone, then sync.
 
I'm setup to import images into iPhoto.

Once done it asks if I want to delete all from phone.

Never tried to use iTunes for photos.
 
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