Hello, I have a forerunner 245, really happy with it until it displayed a white dot, can you help me with this problem? I received a support link but it didn't include the forerunner 245, I asked again for help but didn't receive help

Hello, I have a forerunner 245, really happy with it until it displayed a white dot, can you help me with this problem? I received a support link but it didn't include the forerunner 245, I asked again for help but didn't receive help