[Q] Pull pictures from locked s6 edge

Here's the case.
The 6S Edge with no Samsung or Google account set up.
One day the FP just stopped recognizing the finger, so I am officially locked out.
Photo content on device is precious and has to be rescued, pulled out.
Need a solution to carry this out without tripping the KNOX and if possible saving stock ROM.
How can I do that with minimum fancy?
The device is european, without carrier lock.
Any solutions? Thank you.