How do I factory reset the DR-P520 Osaka Pocket/Handheld Portable Digital Radio?
Press and hold the button until <Factory reset> appears, then select it to confirm the operation. The radio must be connected to a power supply via USB for this process to proceed successfully. If you choose 'Yes' but the device is not connected to a power source, an error message will appear prompting you to connect it first. (Page 23)
From the official Ultimate Speed Ulgd 5 0 E4 Car And Motorcycle Battery Charger manual, page 23
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