If you see "Err -4" more than twice, the triac (power regulator) may be failing. Discontinue use and contact Unitek service.
Follow this exact sequence as confirmed in the official manual: unitek yst03004 manual verified
Browse saved files. Use the 'Up/Down' keys to navigate and 'OK' to play video clips. Connecting to a PC The YST03004 is "verified" for use with Windows and macOS. If you see "Err -4" more than twice,
According to verified user guides and product documentation: use the following verification checklist:
For manuals and setup guides related to Unitek electronic products (such as hubs, docking stations, and peripherals), the most reliable sources are:
If you have a PDF or printed manual, use the following verification checklist: