For the Samsung BD-J5700, there is a legendary "Master Reset" code that sometimes resets the counter back to 5. This does not work on every firmware version, but it works on many.
Purchase a Professionally Modified UnitThe most reliable way to own a region-free BD-J5700 is to buy one that has been hardware-modified. Specialty retailers take the standard player and install a third-party chip (often called a "mod-chip") that bypasses region checks entirely. These are usually labeled as "Region Free" or "Multi-Zone" players on sites like Amazon or specialty home theater shops. samsung bd-j5700 region free code