How to update internal Multi-Module on Radiomaster TX16s

The Radiomaster TX16S transmitter comes with an internal Multi-Module, fully supported by the Multi-Module open-source firmware . The Internal Multi-Module is the (hardware) part of your TX16S transmitter that wirelessly sends all the data coming out of OpenTX (gimball position, stick position, etc) to your rc model. So it’s not enough to only update OpenTX (read our guide how to update OpenTX), but you also need to update the internal Multi Module. The firmware running on this module is responsible for sending out the input from OpenTX to your rc model.

New features, supported rc protocols and ways the Multi Module interacts with OpenTX are added to the MultiModule firmware at a steady pace, so there comes a time you need to update this firmware. OpenTX also checks to make sure that you are running the latest stable Multi-Module firmware. Maybe you noticed the message in OpenTX: “Module update recommended”?

Updating the internal Multi-Module firmware is pretty easy, thanks to the possibility to flash your MultiModule through OpenTX! In this short guide, I will help you to update your MultiModule step by step!

1. Check current internal Multi-Module version

Let’s start by checking what Multi Module firmware version you are currently on, since it would be unnecessary to update your internal MultiModule if you are already on the latest version.

How to update the internal MultiModule on the RadioMaster TX16s
  • Turn on your RadioMaster TX16s
  • Long press the ‘MDL’ button
  • Navigate to the ‘MODEL SETUP’ tab (it’s the first containing your model name/model image/etc)!)
  • Scroll down to “Internal RF”
  • If you have enabled the MULTI module for this model, you will see the Module status being shown. In my case V1.3.1.1 TAER. This means my internal MultiModule uses firmware version with channel order TAER (more on this later).
  • If you have not enabled the MULTI module for this model, enable it temporary to see the Module status containint the firmware version.
  • Remember your multimodule firmware version, so you can compare your version with the newest version in step 2.

2. Download the newest firmware for the internal Multi-Module

Start by downloading the newest firmware for the internal Multi-Module inside your RadioMaster TX16s. This firmware is needed to update the internal multi-module

  • Go to
  • At “Multi-Module Selection” choose: RadioMaster TX16S Internal Module
  • At “File Filters” most of the options are prefilled now.

    All you have to do is pick the right Channel Order. The Channel Order is based on your settings in OpenTX.

    To find your Channel Order:
    Turn on your TX16s –>
    Long press ‘SYS’ –>
    Navigate to “RADIO SETUP” tab (short press 2x ‘page>’) –>
    Scroll to the bottom and read what’s behind ‘Default channel order’
  • Pick the right Channel Order. I use TAER
  • If the current firmware version on your internal module is the same, you don’t have to update.
  • If the current firmware version on your internal module is older than the newest multimodule firmware: Under Firmware File, download the *.bin file. In my case: ‘multi-stm-opentx-taer-noinv-v1.3.1.9.bin’
Download the MULTI-Module firmware

3. Connect your RadioMaster TX16S to your pc

In order to flash the internal MultiModule firmware to your well…internal Multimodule…you need to transfer the *.bin firmware file you’ve downloaded in step 1 to the sd card of the TX16s. If you already know how to transfer files to your TX16s, transfer the *.bin file to your ‘FIRMWARES’ folder. For all other users we will show you step by step how to do it.

  • Turn on your RadioMaster TX16S
  • Attach a USB-C cable to the top USB-C port of your TX16s and connect it to your computer.
  • Your TX16S Display will show a pop-up, asking you to select “USB Joystick (HID)” or “USB Storage (SD)”.
  • Use your scrollwheel to navigate to “USB Storage (SD)” and click on the scroll wheel to select it.
Choose USB Storage to update the internal multimodule
  • The TX16S is now connected as a USB storage device to your pc.
  • Go to “My Computer” or your file explorer and open the SD card of your Radiomaster TX16s (in my case USB Drive (G:).
  • Open the folder “FIRMWARE”
  • transfer the *.bin file (containing the MultiModule firmware) downloaded in step 1 to the “FIRMWARE” folder
access your RadioMaster TX16S sd card

The MultiModule *.bin firmware file is now succesfully transferred to your TX16S.

Disconnect the TX16S from your pc.

4. Flash the new firmware to your internal Multi-Module

This is the last step. All we have to do now is flash the internal MultiModule using OpenTX.

  • Long press ‘SYS’
  • Short press ‘page>’ to go to the “SD-HC CARD” tab
  • Scroll to ‘[FIRMWARE’]. When it’s highlighted press ‘Enter’ by clicking on the scrollwheel.
  • Scroll to the *.bin file downloaded in step 2 and transferred to your tx16s in step 3. When it’s highlighted long press ‘Enter’ by clicking on the scrollwheel.
  • navigate to ‘Flash Internal Multi’. When it’s highlighted press Enter.

OpenTX will start flashing the firmware to your internal multi module! It will shows a screen saying “Writing” and after the flashing has finished it will say “Flash successful”.

Flash the internal multi module
writing the internal multimodule

You can now verify that your internal multi module is flashed with the firmware file downloaded in step 2. To do so, simply repeat Step 1 to check the firmware version!

Thats all! Now you know how to update the internal Multi Module of your TX16S!

9 Comments on “How to update internal Multi-Module on Radiomaster TX16s”

  1. Hi,
    very nice side baout the Radiomaster.
    The firmware update guide is very useful. Many thanks

    I have a question:
    Starting with Firmware 1.3.24 (newest at this time is 1.3.36) there is an additional zip file named MultiLuaScripts. Do somebody knows what to do with the content of the zip file?

    There is a also a file named For what is it ?

    1. I put those lua scripts on the SD card>SCRIPTS>TOOLS
      Those are where my other lua scripts are

  2. Will the multi module update also update the firmware for the latest FrSky receivers? I have read that if I update the Rx firmware I will also have to update the TX firmware (not open TX).

  3. Hello Just got my new TX16S but my computer does not recognize it all . Tried my other laptop ..same is there any solution?

  4. Hello
    My tx16s suddenly went on emergency mode and cant do anything. Please help me. I tried updating the multi to the latest multi-stm-opentx-aetr-noinv-v1.3.1.65.bin but no luck.

  5. So I followed the instructions on “how to update OpenTX” and I also followed the instructions on “how to update the internal multi module on radiomaster tx16s”.
    For one reason or another now my “TOOLS” menu is “broken”.
    Any Idea how to fix this? At the moment I cannot find anything related to my “problem”.

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