In this video, we're covering the Smart Dual-Core UART Serial Bridge powered by the Raspberry Pi RP2040! Designed specifically for router recovery, hardware diagnostics, and bootloader manipulation, this tool brings automated boot interruptions, OLED terminal output, and visual LED diagnostics to your workbench.

🔗 **DOWNLOADS & RECURSES:**

• Firmware, Project Files, Full Documentation & Guide Download links: 

Smart Dual-Core UART Serial Bridge 200 MHz 200MHz (Performance / Overclock Mode): Excellent for driving dual-core processing alongside fast OLED display redraws and high-baud-rate serial buffering (e.g., 1.5 Mbps–3 Mbps logs) without dropping frames or serial bytes.

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Smart Dual-Core UART Serial Bridge 133 MHz  133 MHz (Stock / Safe Mode): The official standard clock rate for the RP2040. Perfect for standard serial bridging, minimizing heat, and ensuring rock-solid stability across all cheap breadboards, Dupont jumpers, and power setups.

⏱️ **CHAPTER TIMESTAMPS:**

00:00 - Introduction & Overview

01:15 - Hardware Setup & RGB Solder Jumper

02:45 - Pinout & Wiring Diagram

04:10 - Auto Router Identification (BCM / QCA / MTK)

05:55 - Physical USR Button Controls

07:30 - Host Control Commands (...RP Suffix)

09:45 - TFTP Recovery Demonstration

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📋 **QUICK TECHNICAL SPECIFICATIONS**

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• Controller: YD-RP2040 / Raspberry Pi RP2040 (Dual-Core ARM Cortex-M0+)

• Core 0: OLED Display Engine, WS2812 RGB LED Handler, UI Timing

• Core 1: High-Speed UART Pass-Through, Line Signature Matching, Key Handler

• Baud Rates: 9600 to 921600 (Default: 115200)

• Display: 128x64 SSD1306 OLED (Software I2C)

📌 **HARDWARE PIN MAPPING:**

• (GND) Ground return preceding OLED VCC

• GP6  ➜ OLED VCC Power (Boosted 3.3V)

• GP7  ➜ OLED SCL

• GP8  ➜ OLED SDA

• (GND) Ground return preceding GP16

• GP16 ➜ Target TX (RP2040 UART0 TX → Target RX)

• GP17 ➜ Target RX (RP2040 UART0 RX ← Target TX)

• GP23 ➜ WS2812 RGB LED (Requires solder jumper bridge)

• GP24 ➜ USR Key Tactile Switch (Active LOW)

• GP25 ➜ Blue Status LED

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🚨 **VISUAL LED DIAGNOSTICS ENGINE**

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• Solid Green ➜ Receiving Data (Target → Host RX)

• Solid Red ➜ Transmitting Data (Host → Target TX)

• Solid Yellow ➜ Active Full-Duplex Traffic (TX + RX)

• Flash Blue ➜ SoC Signature Auto-Identified

• Rainbow Cycle ➜ TFTP Recovery Active (BCM Hardware Only)

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🔍 **AUTOMATIC SOC IDENTIFICATION**

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• BCM ➜ Broadcom CFE Bootloader

• QCA ➜ Qualcomm / Atheros U-Boot

• MTK ➜ MediaTek / Ralink U-Boot

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🔘 **PHYSICAL USR BUTTON ACTIONS (GP24)**

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• Short Tap (< 400ms):

  - Broadcom: Stops boot to CFE command line

  - Qualcomm: Stops boot to CFE command line

  - MediaTek: Stops boot to CFE command line

• Long Press (≥ 400ms):

  - Broadcom: Starts the TFTPD Service for firmware upload

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💻 **HOST TERMINAL COMMANDS (...RP Suffix)**

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• BAUDRP <rate>  - Dynamically set UART speed (e.g., BAUDRP 115200)

• BREAKRP        - Send 250ms hardware BREAK signal on TX line

• STOPRP - Auto-trigger architecture boot-stop sequence emulates USR button 

• TFTPRP - Force target into TFTP server recovery mode

• INVERTRP       - Toggle inverse OLED display mode

• HEXRP          - Toggle ASCII vs Raw Hexadecimal display view

• CLSRP          - Clear OLED screen buffer

• STATUSRP       - Print system status, active baud rate & host info

• LOGRP          - Display lifetime RX/TX byte counters

• UPTIMERP       - Output running system uptime

• FREERP         - Display free SRAM memory

• REBOOTRP       - Reset RP2040 microcontroller

• BOOTLOADERRP   - Jump to USB BOOTSEL mode for firmware flashing

Download full Manual Click -> User Manual PDF

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⚠️ **DISCLAIMER:**

This project is provided for educational, diagnostic, and research purposes only. Always check logic levels and verify pin voltages with a multimeter before making physical connection to target boards!

• Full Document Above in PDF format Download here: Netgear R8000 Recovery / Unbrick Guide PDF
• Linksys MR7350 Router Simulator: https://richardlloydusa.com/linksys-mr7350-router-sim
• Official Website: https://richardlloydusa.com