This is the most common and effective method for a frozen meter that isn't responding to key presses. It cuts all power to the meter, forcing a full hardware reboot.
Mrs. Phiri laughed. “Relax. A ZESCO prepaid meter is like a stubborn phone. Sometimes it just needs a restart.” how to reset zesco prepaid meter
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“It’s not the token,” his neighbor, Mrs. Phiri, said, peeking over the fence. “My power is fine. Your meter has frozen. You need to reset it.” This is the most common and effective method