If you've confirmed the problem isn't cable-related, follow this triage sequence, starting with the easiest and least invasive software fixes.
: A common fix for "unstable comport" errors involves using a Virtual Serial Port Driver . unstable usb port miracle box 282 solution
If your hardware feels loose, watch this quick guide on tightening a physical USB connection: Fix Loose USB Port YouTube• Jul 26, 2022 To help you get back to flashing, could you tell me: What are you using? Does the error happen immediately or mid-process ? Are you using a Miracle Box Dongle or the cracked version ? Fix Loose USB Port If you've confirmed the problem isn't cable-related, follow
If virtual ports do not resolve the issue, address potential driver conflicts or hardware connection protocols: Does the error happen immediately or mid-process
Replace hub with a powered hub if needed
Navigate to > Advanced options > Startup Settings > Restart .
This is a well-known solution within the repair community for fixing stubborn "unstable comport" errors on many MTK devices. The logic is that creating a new, virtual COM port pair can bypass the driver conflict.