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Press and hold the Menu button (the center section with the + and - buttons to the sides) until you hear a beep (3 seconds or so). After that, when you press and release the Menu button, the Channel number should flash indicating that you can change the channel. In the future, you can toggle the keypad lock by pressing and holding the Menu button.
I hope this helps. I usually use my Motorola Talkabout radios with the keypad lock active. I hit the various button accidentally when working in the field.
Can You use the buttons? Press the right button with a white bar, just below the screen. This should open the Tools menu. If it does, use Exit and leave AppCenter. If this works, You can test if the touch screen is defect or if AppCenter installation is corrupted. If the screen is ok, reinstall AppCenter.
To start a cycle when the child lock has been activated you have to keep the start button pressed for a least 5 secs. Check your user manual for deactivation of child lock.
If you don't have the manual, use the link to download a copy, you will need the Enr number from the sticker on the inner door. http://www.bosch-home.co.uk/quick-links/customer-service/download-product-manuals.html
I have the same problem- Yesterday I bought my second hand and the phone number wasnt programmed into the phone either. Try doing it like this 74663# press menu and press menu again it should bring up the user activation
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