Here are some resources that will help fix the common problems you may encounter:
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eKEY Error Code Guide - When the Supra eKEY doesn't function properly, it will display a four-digit error code. This guide provides fixes for most error codes that you may encounter.
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No Cell Service, No Problem - Press “update” located at the bottom of the App every day, especially before going out of reception.
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Supra eKEY Resource Page