You can set a 4-digit PIN that must be entered to access the store and web browser on your eReader.
To turn it on, go to Settings and select Accounts.
If your book's table of contents contains multiple levels, it will be indented for better readability.
Typing is now more responsive when searching.
Wi Fi now reconnects more quickly before you search the store, allowing search suggestions to appear as you type.
Previously, when reading .MOBI books, your progress was not remembered.