Pressing left-button during power-on (or while QRP Labs is still showing on the screen) will cause the EEPROM to be completely cleared.? This is a design feature - perhaps it would be better implemented on a different button.
And yes, you will need to re-select your 'Band version' and re-calibrate and re-enter all of your configuration settings.
This has happened to me a couple of times when I press the menu button too quickly.
