"Buttons not reacting even after change of the battery"に関する回答Hey guys, struggled with this too, but found the answer on another forum. (1) Press and hold the TIME button or CLOCK button for more than 2 seconds, until two numbers flash on the screen. (2) Change this number using the + and - buttons on the back to the correct year (20xx, where xx correspond to the year). Press the TIME button or CLOCK button. (3) Enter the correct month and date (in this order for the EU version at least) using the + and - buttons, and press the TIME button or CLOCK button. (4) Press the + button or the - button to select the time as required, then press the TIME button or the CLOCK button. You can always start at 1 again if you incorrectly fill in the time/date/year.