I entered my 4 digit pin code wrongly three times by mistake, and my Matsui VX1107A vcr screen went blue with the word Protected across the screen.
I'm pretty sure I unlocked it by switching the vcr off by pulling the plug out from the mains for a couple of hours, then put the plug back in, switched the vcr on with the remote then held the (up arrow and the record buttons) together at the same time for about 5 seconds, this action unlocked mines the screen comes up to give you another 3 attempts to get your pin right.
Not sure what to do if you don't have the pin number to revert it back to the factory settings.
And also don't think you have to leave the vcr unplugged for several hours, 30 mins should do if not leave for an hour.
Robert
February 2010