Tablet wants password after battery replacement? I never had one!

After replacing the battery on my Samsung Galaxy Tablet 10.1, it is asking me for a password.

Since it was new, I have never used a password.

What can I do without losing my photos and documents?

Thank you in advance for your help.

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0

crwdns2942205:01crwdne2942205:0:

Have you backed up your device? The only way I know how to get around this is a factory reset which would mean losing all of your data...

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

crwdns2934285:0crwdne2934285:0