For technicians and advanced users who work with firmware repair, unlocking, or flashing of mobile devices using Miracle Box , encountering errors is a routine part of the job. Among the most frustrating and frequently reported issues is the "Open port error – port is occupied or non-existent."
If you continue to face the issue, consulting Miracle Box community forums (like GSM-Forum or ChinaGSM) with your specific phone model and COM port log can provide device-specific insights.