SKU: 73767314442

RadioMaster ExpressLRS USB UART Flasher V2

Sale price$13.49 Regular price$14.99
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Ships within 48 hours · Estimated delivery Sep 12 - Sep 17

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Description

RadioMaster ExpressLRS USB UART Flasher V2Upgrade your ELRS firmware with ease using our simple and effective tool. The new V2 version features a USB C interface, enabling you to connect the tool to your PC via cable. The new power button allows effortless power cycling with a single press, eliminating the need to struggle with cables while holding down buttons. Our streamlined design makes preparing your receiver for a firmware update faster, easier, and more efficient than ever! When it

Upgrade your ELRS firmware with ease using our simple and effective tool. The new V2 version features a USB-C interface, enabling you to connect the tool to your PC via cable. The new power button allows effortless power cycling with a single press, eliminating the need to struggle with cables while holding down buttons. Our streamlined design makes preparing your receiver for a firmware update faster, easier, and more efficient than ever!

When it comes to updating your ELRS receivers, you're faced with two options: Wi-Fi or Serial Port. While Wi-Fi upgrading may seem convenient, it can be unreliable due to network instability. This can result in a bad flash, requiring recovery with a UART tool. That's where the V2 ExpressLRS USB UART Flasher comes in, offering a reliable and easy solution for your firmware upgrade needs.

With the RadioMaster V2 ExpressLRS USB UART Flasher, your wireless connection won't be a concern. This dongle is specifically designed for ELRS receiver serial port upgrades, providing a reliable and easy solution for flashing or recovering receivers with a bad flash. 

Our USB flashing tool is a versatile solution, not limited to ELRS serial port upgrades. It comes with a range of connection options, allowing easy connection to our entire range of receivers. By switching between 3.3v and 5v, it can also be used for other devices requiring a UART interface. This versatility makes it a valuable addition to your toolkit, catering to all your firmware upgrade needs.

Check out all our ExpressLRS ProductsReceivers, and the rest of our RadioMaster Products! 

Features

  • Upgraded USB-C interface
  • Power button for easy ON/OFF power cycling
  • Reverse polarity protection
  • Over-voltage protection 
  • Switchable power supply between 3.3V and 5V
  • Standard 2.54mm pins
  • RM-CRSF JST-GH port for simple plug-n-play connection with RadioMaster ER series receivers
  • Pin sockets included
  • Dupont cables for convenient testing

Compatible Receivers

Using 2.54mm pin output and spring-loaded pin adapter or Test hook adapters:

Using regular 2.54mm pin output (Servo plugs):

Please note: The second channel is repurposed as a TX for the serial port tool's RX port, while the third channel is repurposed as an RX connected to the serial port tool's TX port.

Firmware upgraded by RM-CRSF interface output:

Please note: The above receivers can be connected to the receiver's CRSF port using a 4-wire CRSF cable.

Firmware upgrade instructions

  1. Connect the Serial Port Cable with the receiver
  2. Connect to the computer with a USB extension cable, press the receiver's BOOT button, then press the POWER button on the serial tool
  3. Follow the ELRS upgrade tool's instructions to complete the upgrade

Download

Size

Package Includes

  • 1 * RadioMaster ExpressLRS USB UART Flasher V2
  • 1 * Pogo Probe
  • 1 * CRSF Wire 
  • 1 * 2.54mm Serial Port Cable - Type B
  • 1 * Serial Port Test Hook - White
  • 1 * Serial Port Test Hook - Green
  • 1 * Serial Port Test Hook - Red
  • 1 * Serial Port Test Hook - Black
  • 1 * User Card

    Shipping Notes
    • Free Standard Shipping on $100+ Orders to the USA.
    • Except Preorder products are shipped in 48 hours.
    • Delivery to the USA:
    1. Standard Shipping : 3-10 business days
    • If time is of the essence, please consider selecting expedited delivery for faster service.
    Exchange/Return Notes
    • We offer a 30-day return/exchange service after receiving.
    • Final sale items are not eligible for returns or exchanges.
    • To process your return/exchange, please contact us at [email protected]
    • Please click here for more details>>> Return & Exchange Policy
    SKU: 73767314442

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    Kelley
    Port Orchard, US
    ★★★★★ 5
    Works great
    Size: 8.8" x 9.3" x 1.2"
    This fit perfectly in my 2017 Acura MDX. I can change my own filter in less than 5 minutes and it costs much less than the OEM. The filters lasted me about a year before I needed a new one.
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    Reviewed in the United States on May 28, 2026
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    Plis
    Whiting, US
    ★★★★★ 4
    Encaja perfecto
    Size: 8.8" x 9.3" x 1.2"
    Trabajo muy bien
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    Reviewed in the United States on March 24, 2026
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    Mathew
    Los Angeles, US
    ★★★★★ 5
    Great product !!!
    Size: 8.8" x 9.3" x 1.2"
    The product was in great shape when delivered. Even though the package was thin as it is the delivery was made with card and all was well with product. The instructions were good to use and change in my car. Also it showed the make of vehicle so I won’t be confused at all. Overall it was a great buy
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    Reviewed in the United States on May 13, 2026
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    Amazon Customer
    Los Angeles, US
    ★★★★★ 5
    Fits my Accord perfectly!
    Size: 8.8" x 9.3" x 1.2"
    Fits my 2008 Accord perfectly and feels just as sturdy as the OEM I used before, which cost nearly twice as much. Plus, it includes activated carbon, something the OEM didn’t have.
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    Reviewed in the United States on May 15, 2026
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    Susan F. Montville
    Phoenix, US
    ★★★★★ 5
    Easy to do it yourself and save!
    Size: 8.8" x 9.3" x 1.2"
    One place wanted $85 to replace this! Another wanted $50! I ordered this for $10, watched a YouTube video and did it myself! Super easy!
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    Reviewed in the United States on May 10, 2026

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