SKU: 73767314442

RadioMaster ExpressLRS USB UART Flasher V2

$13.49 $14.99
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Ships within 48 hours · Estimated delivery Jul 13 - Jul 18

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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 Products, Receivers, 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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    4.0 ★★★★★
    Based on 1879 reviews
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    J
    Verified Purchase
    JimSack
    Natrona Heights, US
    ★★★★★ 5
    He loves them
    Size: 20 x 4 x 4 in, Pattern Name: Eggplant, Size: 20 x 4 x 4 in, Pattern Name: Eggplant
    Our Dog absolutely loves this little toy. Have a stock pile because, like all dog toys, they need replacing.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on May 23, 2026
    V
    Verified Purchase
    V. Locke
    Port Orchard, US
    ★★★★★ 5
    Great dog toy
    Size: One Size, Pattern Name: Corn
    My dog loves this toy. It is sturdy and great squeaker.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on November 15, 2025
    A
    Verified Purchase
    ana
    Waukegan, US
    ★★★★★ 3
    Cute but red fur does chew off 😜
    Size: 20 x 4 x 4 in, Pattern Name: Pepper
    My dog loves this hot pepper. It's our 2nd but the red fur does come off so don't leave your pet unattended with it for an extended amount of time.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on February 10, 2026
    A
    Verified Purchase
    AmazonBob407
    Battle Creek, US
    ★★★★★ 5
    This worm, pretty sure it’s a worm and not a snake, can take a lot of abuse.
    Size: X-Large (Pack of 1), Color: Blue Snake, Size: X-Large (Pack of 1), Color: Blue Snake
    Snake, worm, whatever, my dog doesn’t care, she loves it all the same. My little friend can be kinda rough with her toys. This is no exception. The pictures are from roughly one month of giving it to her and include playing with it at least every other day or so. The top is holding up well, but the bottom has taken some damage, and two of the squeakers have long since been destroyed. Despite this, my dog still loves playing with it. We normally play tug of war together, but on her own she chews at it to get to the squeakers inside, which she promptly destroys, which I’m totally fine with, as quiet toys are much preferred, by me, not her. I believe there are 4 in the XL size that we got. We’ve had a few of these in the past. We tend to get about 6 months out of them. After she “lovingly” removes the squeakers, she doesn’t chew on it much, and we just use it for tug of war, but at that point she’s done enough damage to the underside that its time is limited. But, as it’s pretty low priced, for the time and enjoyment we do get out of it, it’s very much worth it. I do need to clarify, the durability is actually quite good, I don’t fault the product as at all, it’s just my dog is equally as good with destruction, but it should be noted this toy does last much longer than most of her victims. The color, (we got the blue and green) is also very vivid and nice, as is the texture. We’ll be purchasing again.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on September 23, 2024
    K
    Verified Purchase
    Katie Lee
    Boise, US
    ★★★★★ 5
    Awesome toy!
    Size: X-Large (Pack of 1), Color: Blue Snake
    My pitbull Stella loves these! Ive bought her two of the smaller snake toys in the past and she Absolutly loves them! The first one lasted about 6 months which is a lifetime compared to how long her other toys last lol and the second one lasted about the same. This time I decided to get the XL version. It has 6 squeakers instead of 3 like the smaller versions. I picked the teal and purple colors and it's like 43 inches long I think. Its the same length as her and shes a large size dog. She loves this thing! Its so cute watching her squeak each of the squeakers with her nose. While this is a great toy it is not chew proof. In fact its quite easy for an experienced chewer to get into this toy. It is relatively strong but it wont stand a chance with a power chewer. Like I said this is the third one of these I have bought in roughly a year. They do last longer then more soft toys I will give them that. This is the only soft toy she has not destroyed in 5 mins. But after a week or so at least one squeaker will be missing. For the average dog one of these snake toys will last a really long time and they are fun to play with. We play tug of war and fetch with it. Stella also loves when I squeak the toy she will squeak it back and we'll go back and forth for hours lol. One last thing it is loud! If noisy toys bug you, don't get this. The sqeakers are industrial strength lol
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on February 7, 2021

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