If you still see "bootrom error wait for get please check stb uart receive full" after all steps:

Final tip: Search your exact STB model + "bootrom error uart receive full" – many OEM bootloaders have subtle timing quirks fixed by custom scripts or specific terminal software (e.g., uboot-tools on Linux with kermit).

Troubleshooting the "Bootrom Error: Wait for Get, Please Check STB UART Receive Full"

If you are trying to flash a firmware update or unbrick a digital set-top box (STB) and you've encountered the cryptic message "Bootrom error: wait for get please check stb uart receive full," you’re likely dealing with a communication breakdown between your PC and the device's processor.

This error is most common in devices using Montage, Ali, or NationalChip chipsets. It essentially means the computer is sending data, but the STB's hardware buffer is overflowing or not acknowledging the handshake.

Here is a comprehensive guide to understanding why this happens and how to fix it. What Does This Error Actually Mean?

To understand the fix, you need to understand the "conversation" happening:

Wait for Get: The computer (via the flashing tool) is waiting for a "Ready" signal from the STB.

UART Receive Full: The Universal Asynchronous Receiver-Transmitter (UART) is the hardware component responsible for serial communication. "Receive Full" indicates that the STB's data buffer is jammed. It cannot process the incoming bits fast enough, or the data is arriving "corrupted," causing the buffer to hang. Primary Causes

Incorrect Baud Rate: The "speed" of the data transfer doesn't match between the software and the hardware.

Poor Physical Connection: Loose TX/RX wires or a faulty RS232-to-USB adapter.

Power Sequencing: The STB wasn't powered on at the exact moment the software expected it.

Driver Incompatibility: Using an outdated or incorrect Prolific/CH340 driver for your USB-to-Serial cable. Step-by-Step Solutions 1. Check Your Wiring (The "TX/RX" Swap)

The most common hardware mistake is the wiring. In serial communication:

TX (Transmit) on your adapter must go to RX (Receive) on the STB.

RX (Receive) on your adapter must go to TX (Transmit) on the STB. GND (Ground) must be connected to GND.

If you have TX to TX, the STB will never "receive" the command, leading to a timeout or a buffer error. Try swapping the TX and RX pins to see if the error clears. 2. Adjust the Baud Rate

Flashing tools (like the Montage "Upgrade.exe" or GX6605S Downloader) usually default to 115200. However, some older boards or specific recovery modes require a slower speed to prevent the "Receive Full" error. Go to Device Manager > Ports (COM & LPT). Right-click your Serial Port > Properties > Port Settings.

Try lowering the Bits per second to 9600 or 57600, and match this setting inside your flashing software. 3. The "Power Cycle" Timing

Bootrom errors often occur because the STB is already in a "frozen" state when the software tries to talk to it. Turn the STB OFF (unplug the power). In the PC software, click "Start" or "Connect" first.

Only then plug in the power to the STB.The software needs to catch the "Bootroom" signal the millisecond the chip receives power. 4. Use a Different USB-to-TTL Adapter

Cheap RS232-to-USB adapters (especially those using "fake" Prolific chips) often have timing issues that cause the STB buffer to overflow. If possible, switch to an adapter using the CP2102 or FTDI chipset, as they handle high-speed serial data much more reliably. 5. Disable "FIFO" Buffers in Windows

Windows tries to manage serial data by buffering it, which can interfere with the STB's simple Bootrom logic. In Device Manager, go to your COM port Properties. Click Advanced.

Uncheck "Use FIFO buffers" (or slide both bars to the far left/lowest setting). Restart the software and try again. Summary for Specific Chips

Montage Chips (CS6001/CS8001): Often require the "Receive Full" fix by using a 4-pin header instead of the standard RS232 port.

GX6605S: Highly sensitive to the quality of the GND (Ground) wire. Ensure your ground is solid, or the data will be "noisy," filling the buffer with junk.

By methodically checking the timing of the power-on and the integrity of the TX/RX crossover, you can usually bypass this error and proceed with your firmware flash.

Are you using a USB-to-TTL adapter or a standard RS232 cable for this connection?

This error typically occurs when a Set-Top Box (STB) upgrade tool (like GXDownloader

) is waiting for a "handshake" or response from the device's BootROM via the serial interface, but the communication is failing

. It often means the tool cannot establish a connection to start the data transfer. Top Troubleshooting Steps Check Physical Connections & Power Cycle Power Timing : Click "Start" on the upgrade tool

, and then power on or restart your STB. The tool needs to be in its "waiting" state when the box triggers its boot process. GND Connection : Ensure the Ground (GND)

wire is securely connected between your USB-to-UART adapter and the STB's UART pins. RX/TX Swap : Verify that your (Transmit) pin on the adapter is connected to the (Receive) pin on the STB, and vice versa. Verify Serial Settings & Hardware Voltage Level : Most STBs use

. Check that your adapter is set to 3.3V rather than 5V to avoid communication errors or hardware damage. Driver & Port : Confirm that the RS232/UART driver

is correctly installed on your PC and that you have selected the correct in the tool. Cable Type

: Ensure you are using a proper serial cable; some setups require a cross-over (null modem) configuration. Software Configuration (GXDownloader Example)

: Ensure you have selected the correct chip model (e.g., "Others" or a specific GX chip). : Double-check that you have selected the correct file for your specific STB hardware. USB Interference

: Disconnect other unnecessary USB devices from your PC to prevent interference with the serial signal. STMicroelectronics Community Alternative Fix: USB Recovery

If UART flashing continues to fail, many modern STBs support a "blind" USB recovery: Rename your firmware file to and place it on a FAT32 formatted USB drive Insert it into the STB and hold the button on the front panel while powering the device on. Are you using a specific upgrade tool like GXDownloader , and have you already tried swapping the RX and TX

This error typically occurs when you're trying to flash or recover a set-top box (STB) or similar embedded device using a serial (UART) connection. It essentially means the device's BootROM (the permanent, read-only code that starts the system) is waiting for data but its input buffer is full because it can't process the incoming signals correctly. 🧩 What the Error Actually Means

"Wait for Get": The BootROM is stuck in a loop, waiting to "get" a valid command or handshake signal from your computer.

"UART Receive Full": The internal hardware buffer for serial data is full. This usually happens when the data being sent doesn't match the expected format (like the wrong baud rate), causing "garbage" characters to pile up until there's no more room. 🛠️ The "Detailed Story" of Why This Happens

This isn't usually a hardware failure, but a misalignment between your PC and the box. Here are the most common culprits: 1. Baud Rate Mismatch (The #1 Cause)

The BootROM expects data at a very specific speed (often 115200, 9600, or sometimes a strange one like 74880 for certain chips). If your PC is sending at 115200 and the box is listening at 9600, the data becomes unreadable "noise" that fills up the buffer without triggering a successful "get". 2. Faulty RX/TX Wiring

Crossed Wires: Ensure your USB-to-UART adapter’s TX (Transmit) is connected to the box’s RX (Receive), and vice versa.

Loose Ground: If the GND (Ground) wire is loose, the signal becomes unstable, leading to erratic data that floods the UART buffer. 3. Power-On Timing

Many STB recovery tools require you to click "Start" or "Connect" on your PC before you plug in the power to the box. If you power it on too late (or too early), the BootROM might miss the initial handshake and enter an error state where it just reports the buffer is full. 4. Driver/Port Issues

Virtual Machines: If you're using a VM, the USB-to-Serial passthrough often fails or lags, causing data overflows.

CH340/PL2303 Drivers: Ensure your USB-to-UART adapter drivers are updated. Cheap "clone" chips often have stability issues with BootROM-level communication. ✅ How to Fix It

Check your Speed: Try the most common baud rates in your software: 115200, 57600, or 9600.

Verify Voltage: Most STBs use 3.3V TTL. If your adapter is set to 5V, it can cause data corruption or even damage the pins. The "Hard Reset" Method: Unplug the STB power. Open your flashing tool (like GxDownloader or Hitool). Select the correct COM port and click "Connect/Start". Then plug in the power.

Shorten the Cables: Long, unshielded serial wires pick up interference from power supplies, which the BootROM interprets as incoming data, filling the buffer.

If you're still stuck, let me know the model of the STB or the chipset (like HiSilicon, Montage, or ALi) and I can give you the exact settings for that hardware.

Manual typing is too slow and error-prone. Use a Python script with precise timing:

import serial
import time
ser = serial.Serial('COM3', 115200, timeout=1, write_timeout=1)
time.sleep(0.5)  # Wait for bootrom to initialize
ser.write(b'\x47')  # Send 'G' (common get command)
time.sleep(0.1)
ser.write(b'\x0d')  # Optional CR
If the above fails:


Modern STBs use 1.8V or 3.3V logic. A USB-to-UART adapter set to 5V can cause erratic reception, misinterpreted start bits, and buffer overruns due to framing errors.


Automated test bench:



Remote device with network: