Does your PC have a , or are you using a USB-to-Serial adapter ? What error message (if any) is showing on the STB display? STB Upgrade Recovery Instructions | PDF - Scribd
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Verdict: If you have a no-name Chinese STB and don't know the chipset, start with STB Upgrader v3.98. If you have a known brand (e.g., Beelink, MINIX), use the manufacturer's official tool. stb upgrader v3.98