How to access iPad 3 memory?

Question

iPad

Guys, help me figure out how to access the memory of ipad 3. Ipad was blocked completely, the child entered the password incorrectly. I know it's a tough question to keep information. But I want to pull this data. I changed the charging socket on the ipad after that the computer does not see it, it writes not an identified device, but it is charging. How to be?