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Settings are stored in SIM-card. SIM-card must be in device to reset settings.
Pull out of device the battery. Wait 3 minutes.
Next step is depending on the version of alarm.
Switch jumper to "ÏÐ" position. Insert battery. Keep the "R" button on. Wait for the string of short beeps.
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Push "R" button. Insert battery. Keep the "R" button on. Wait for the string of short beeps.
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Settings are reset.
Pull out the battery and switch back jumper to "×" position.
Keep the "R" button off.