Sim card factory reset my S7 without asking permission Used the device for a long while (without sim) amassing a huge number photos and work files very important to me....

finally put an active sim card in. Without any prompts, phone begins downloading an update, then powers down to 'install update' then proceeds to reset and 'erasing data' ....

Boots up into setup as if i just got the phone.

All my apps, photos, data gone.

A) Is it possible to recover my data

B) why on earth did it do thiss

[Samsung Galaxy S7 Edge with Telus (Canada) sim card]
A.) Unfortunatelly if you didn't made a backup from your pictures, apps, data it's all gone.

B.) I'm a bit confused because your phone won't be download and install any system update without prompt. The auto download part is hardly possible but the auto-install part, is quite difficult to believe.