Not sure which model of Magnum you have. If you have an MS series, you can try to press the reset button on the back for 15+ seconds. If this doesn't work, try to unplug the data cable on the back and plug in after 15+ seconds. As the last resort, call Magnum tech support, they are very helpful.
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Steven & Polly
2000 Country Coach Intrigue 40' ISC 350
2018 Ford Explorer 4WD
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