An Oppo DV980H can be made region free as follows:
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As to the process of converting the Oppo to become a region free DVD player, its very easy and can be done in less than a minute. Then should you encounter DVDs with RCE, you use the same procedure to set the player back as a Region 1 DVD player.
http://www.dvdtalk.com/rce.html"Q: What is Regional Coding enhancement(RCE)?
A: It's a digital enhancement added to some Warner Bros and Columbia DVDs to stop region 1 (R1) DVDs from playing on Region-free DVD players.
Q: What's the difference between Region Coding and RCE?
A: Regional Coding enhancement(RCE) is an additional layer of protection which some studios have placed on select REGION 1 DVDs to prevent them from playing on region-free or multi-region players."
LGO says:
Procedure on converting the DV-980H
Conversion from Region 1 DVD Player to Region Free DVD Player
Press "Setup" on the remote control
Press "9210"
Press "0"
Press "Setup"
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To play back DVDs with RCE
Conversion from Region Free DVD Player to Region 1 DVD Player
Press "Setup" on the remote control
Press "9210"
Press "1"
Press "Setup"