Sony Dvp-sr200p Multi Region Code How To Make Your DVD Player Multi Regional?

How to make your DVD player multi regional? - sony dvp-sr200p multi region code

I'm Australian, which are 4 region. I like to play a region 1 DVD of these two DVD players. The brands and models are:

Sony DVP-SR200P
Magnavox-MDVD65

Is there a way to check to see how they are regional, and if you do not play, not the region 4, it is possible to make multi-regional?

Thank you:)