: Most STBs use 3.3V TTL logic . If your UART adapter is set to 5V, it may cause errors or damage the chip. Conversely, if the signal is too weak, the processor won't "hear" the computer.
MediaTek:
to: [20:34:15] HUB 1-1: Download DDR.USB [20:34:18] HUB 1-1: Download UBOOT.USB [20:34:22] HUB 1-1: Erase Flash... : Most STBs use 3
The is the very first code that runs when a device is powered on. It is hardcoded into the chip and cannot be modified. Its job is to initialize basic hardware and load the next-stage bootloader (e.g., U-Boot) from NAND, eMMC, or SPI flash. if the signal is too weak