• Switch off OVI40UI
• Press and hold push buttons F1 F3 F5
• Switch on OVI40, wait for text message, release F1 F F5
• Press simultaneously Band+ and Band- buttons to confirm resetting of settings
• When UHSDR has bootet up long-press System Menu (F1 button) to save values

Hint:

If you just want to play around with default setting without loosing your own configuration:

• do NOT press MENU long
• do NOT switch off via power button because that stores active settings to EEPROM - just pull off power supply.