We are happy to bring you this release of OpenTX 2.3.6. Download and install Companion and use it to retrieve and transfer the latest OpenTX firmware to your radio after configuring the proper radio type.


  • If you are using a color LCD radio and are still using a version between 2.3.0 and 2.3.4 please upgrade! See 2.3.5 release notes for more info
  • If you are coming from a previous major version (e.g.2.2.x) please back up your models and settings before upgrading so that you can go back to your previous version should you not like 2.3 or find issues that make it unsuitable for you. For color LCD radios make a copy of the entire SD card, for B/W radios additionally use the “backup radio to file” companion feature to have a full backup of your radio.

Known issues:

  • If you get an “Invalid Language” error when trying to download firmware after upgrading from a previous major version open the profile settings and reselect your radio type, even if it is already correct.
  • The progress bar in companion when reading firmware from a Horus is broken and will reach 100% at only 25% progress. Just wait, the window will close when the process is finished.

NIGHTLY USERS / RC Users : You will need to reset your companion release type to Stable to get release firmware (Companion/Settings/settings/Application Settings/Release channel)

New since 2.3.5

All radios
  • Tools is now the first screen of RADIO section
  • Allow copy min/max/ppm center to all outputs
  • Fix lag when using USB sim if both modules are off
  • Fix multi firmware flashing on horus when internal module is ON
  • Allow manual control of power pin on radio with SPORT update connector
  • Multimodule: add Spektrum Smart ESC and Smart battery telemetry (thx Javascript)
  • Prevent center beeps been played after boot if already centered
  • Add missing LUA interval in debug screen
  • Improve TextView
  • Fix broken LR12 range check button
  • Chan monitor screen has been added (can display mixer or outputs (select with ENTER button))
  • Improve sensor simulation (should work in most cases)
  • Fix and improve switch position handling on simu start
  • Add T5/T6 handling where applicable
  • Remove EU (D8) option on some radio where it was not applicable
  • Jumper T16 simulator: improve button areas
  • Fix +/-/exit handling on some radio
  • Add color option to drawPoint on colorlcd
  • Add lcd.resetBacklightTimeout()
  • Crossfire: add PREC3 where needed to Crossfire scripts
  • Crossfire: add more telemetry buffer to match Crossfire max lengh specifications
  • FrSky ISRM upgrade : add reset counter when mode is changed
  • FrSky X9E: fix RTC batt voltage readings
  • FrSky X9D: fix RAS
  • FrSky: improve R9-STAB handling (OTA)
  • Jumper T16: do not display uneeded baudrate choice in hardware screen
  • Jumper T16: allow R9M telemetry when used with internal module trainer
  • Jumper T12: fix FM editing while scrolling
  • 9XRPRO: fix companion import/export
  • Crossfire: add support for Bat% sensor

SDCard content for 2.3.6

Note: 2.3.6 uses 2.3v0026.

  • Improve BattCheck widget (thx offer-shmuely)
  • Add missing files to DarkBlue theme
  • More VIRTUAL usage in many scripts(Thanks lich)
  • Some Spanish TTS fixes
  • Some Portuguese TTS fixes

OpenTX Companion 2.3.6 - Windows Installer
If you get an error about “api-ms-win-crt-runtime-I1-1-0.dll missing” install MS VC++ runtime.

OpenTX Companion 2.3.6 - Mac OS X Disk Image

OpenTX Companion 2.3.6 - Linux DEB Package 64-bit

If you need help please refer to the the great communities e.g. openrcforums or RCGroups. You can pop in our chat room where other users and/or devs may be available.


28 March 2020