Grundig GDP 2500 region-free hack

Also works on: GDP 3550, GDP 3570, Livance GDP 2300, Livance GDP 2400, Xenaro GDP 3304

1. Press 'i'

2. Press NEXT TRACK, FAST REVERSE, FAST FORWARD

3. Enter the region you want (multi-region is 0 or 9)

4. (Switch off)

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