Disconnect HDMI, USB peripherals, ethernet, and the power cord.
If you have landed on this article, you are likely staring at a command prompt or a serial terminal screen, frozen on a dreaded line of text:
A failed firmware update, improper shutdown during an update, or corrupt NAND/eMMC flash storage can cause the bootloader to become unreadable. Disconnect HDMI, USB peripherals, ethernet, and the power
Click in your upgrade tool. It should display "wait ROM request...". Immediately power on or restart the STB.
Check your USB-to-UART adapter for a physical toggle switch or jumper block. It should display "wait ROM request
To effectively troubleshoot, it's helpful to understand what this cryptic message means.
Leave it unplugged for at least 15 minutes to clear the capacitors. To effectively troubleshoot, it's helpful to understand what
Once the device is detected, follow these precise steps:
If you have tried all the steps above and still face the same error, it is likely that the flash chip is physically dead, or the UART port on the board is damaged.