I found this site today after getting a Region 2 PAL DVD. The method I tried to use was the first on https://www.videohelp.com/dvdhacks/rca-drc6300n/5592. Every thing was going find until I got to the last two numbers: "f4". How do you change the first number to an "f"? I can only seem to get 0-9.

I want to get it to region 0 aka all regions. My DVD player is coded for region 1.

Also, what were the original first four numbers? I changed those and then thought I should write down the original numbers, just in case. And I had already changed them.

If the method I used above doesn't really work, what other way would be best?