How to connect BLHeli_32 ESC to Configurator BLHeliSuite32 via FC Passthrough

I received my first BLHeli_32 ESC’s (X-Racer Quadrant), and I’d like to share how I use FC passthrough to connect these ESC’s to the BLHeliSuite32 configurator app.

The way “pass-through” works is quite similar to previous versions such as BLHeli_S. Basically it uses the flight controller as a programming tool or adapter to allow the computer to talk to the ESC’s directly, so you can change settings or flash new firmware etc.

However, there are some extra steps to take because BLHeli_32 is a complete new thing.

Software Setup

Hardware Requirement

Make sure your ESC’s are 32-bit ESC’s that are compatible with BLHeli_32. Mistakenly flashing BLHeli_S ESC’s with 32-bit firmware can “brick” your ESC’s and it’s irreversible.

As usual, your BLHeli_32 ESC connects to the FC, and powered by LiPo battery.

Also make sure your computer is connected to the internet! Otherwise firmware flashing is not going to work. Changing settings and configuration is fine without internet though.

Now you are ready!

BLHeliSuite32 V32.0.X

  • In the BLHeliSuite32 configurator, click “Select BLHeli32 interface, and choose “BLHeli Bootloader (Cleanflight)”
  • At the bottom of the window, Port, choose the COM port of your flight controller, and click “Connect”
  • Once it’s connected, click “Read Setup” and your ESC will be read


I can’t connect to my BLHeli_32 ESC with pass-through even with the latest BLHeliSuite32 app. My FC is loaded with the latest firmware. However I can connect to other ESC (not 32bit) without problem with the old BLHeliSuitE.

Your FC is probably not V3.2. You are using the latest stable release which is V3.1.X. V3.2 is not released yet and you need to download it from the link above and load it locally.

I am getting an error when trying to flash new firmware: “Unable to establish server connection!”.

This error occurs when you have no working internet connection on your computer. BLHeliSuite32 checks if your BLHeli32 ESC’s are genuine before flashing new firmware to them. No internet, no check and thus it fails.

I am getting error “Initialization of serial 1wire passthrough or 4way interface failed! Please check Betaflight revision for support of serial 1wire passthrough or 4way interface!”

I was also getting this error when using my Naze32 (F1) flight controller, even with Betaflight V3.2 already installed. I had no way around this error, and I had to use a F3 FC in the end. Maybe BLHeli32 passthrough is not supported in F1 FC’s.

30 thoughts on “How to connect BLHeli_32 ESC to Configurator BLHeliSuite32 via FC Passthrough

  1. Wey Fun


    I am using a AirBot’s Omninxt F7 controller with a Racharlance Fort32 40A 4-in-1 ESC. When I connect the controller via USB and power up the ESC with 6S Lipo, the BLHeli32Suite says “Found 2 ESC with similar unique ID numbers!” . The controller comes with Betaflight 3.4.0 so should not be problem.

  2. Benjamin

    I have a kakute f4 Flight Controller (v1 not v2) running/flashed on Betaflight 3.2.0 And im using BLheli 32bit 30 amp ESC’s Running Dshot 600 and when I try/want to connect BL Heli Suite 32 I keep getting the same error which I cannot find a fix using google/forums searches…Help would be greatly appreciated.

    MY error is :
    Connection to 4-way interface “m4wFCIntf” succeeded.
    Found outdated Protocol revision 106!
    Please update the Interface to a supported revision!
    (protocol 107 or higher)
    Now like I mentioned I cannot find a solution to this problem using google searches and multiple forum searches.

    Any insight?

  3. Andrew Brahim

    Oscar, I found your article helpful, but I’ve ran into an issue with the speed controllers not being found in blheli suite. I first thought it was my servo pins on my Sp racing f4…but it looks correct. Also the escs only light up momentarily when I connect the battery but then turn off. I’m running lumenier 51 A x4 and a 6S battery. I’m trying this with no motors connected…could that be the cause of my error?

  4. confidentcar .

    I was setting up a lumenier 4 in 1 esc 35 amp but by mistake i opened it with blheli s instead of blheli 32 and i flashed the latest blheli s version therefore i briked the esc. Now when i connect blheli 32 it recognize that it has a corrupted file and it tries to erase it but is unable to complete the process, i can not find the proper .hex file to download and manually. Do you have any suggestions?

  5. Rob

    I am constantly getting an error message whenever I try to Read Setup.
    It states
    Serial Interface “m4wFCIntf” connected successfully.

    Connection to ESC#1 failed!
    Please check data- and power-connections to ESC!

  6. nick murphy

    i just wired my “makerfire blheli_32” esc’s to a bff4 board and in blheli 32 suite its saying connection to flight controller failed check usb serial port and power connections. my wiring is good and i have bf 3.2 flashed already. the motors spin from the motor tabs so i know theyre connected. what do i do?

    1. Oscar Post author

      Are you powering up the ESC’s with battery before connecting?
      Also check with Makerfire if they are actually open for connecting to the configurator.
      I had some ESC’s from DYS and that batch was actually locked and i was unable to connect to BLHeliSuite with them.

  7. -G FPV

    Oscar, I’ve been working on new build using the Betaflight F4 along with the Betaflight 32bit 35a ESCs. While in the Betaflight program all four motors spin up correctly and everything seems fine. Turtle mode will activate however the motors do not spin backwards like they should. I’ve downloaded BLheli_32 to try to reflash the ESCs but ESC number four is intermittent and ultimately not found in BLHeli_32 when singled out. I’ve reflashed my FC with the lastest stable version of Betaflight 3.2 and still running into the same problem. Am I over looking something?

  8. phillip pedigo

    Naze32 Rev 5 – BetaFlight 3.2.1 – I am getting an error when i Read Setup on BLheli Suite. Plug in USB to FC then “Connect” in BL heli suite, then plug in batter, then hit “Read Setup”. No worky. “Found Multiple ESC Configuration in SiLabs mode: ESC# 1: –“. I have tried flashing the FC with Betaflight 2.7 (read this in a post and it seemed to work for the guy) still didnt work. Using BLHeli suite 16 and 32 both come with error. Please help!

  9. Jon

    Thank you for the education and walkthrough Oscar. I put it to use tonight and managed to configure everything successfully on my first set of 32b ESC’s :)

  10. ChuckH

    Hello Oscar,

    So I am trying to setup my flight controller and esc’s and am having a hard time getting everything set up. I am new to all this quad stuff so bear with me. I have flashed my FC Naze32 with cleanflight 2.1 and I have been tryiing to setup my esc’s with BLheli suite. If I am not using Betaflight 3.2 should I be using the BLheli suite16 instead? When I attempt to connect to my esc’s with the BlHeli configurator they do not connect at all. When I use Suite32 it kind of connects meaning Suite 32 will read the esc’s and it knows that there are four, but it will not spin them up or allow me to make individual adjustments and such.

    I am sure i need to back up a step to get everything working, what suggestions can you give me?

    1. Oscar Post author

      No, “BLHeliSuite_32” is for 32-bit ESC’s, and you must have the latest Betaflight 3.2 installed on your FC.
      If you are not using 32-bit ESC then just use “BLHeliSuite”, and it should work on Cleanflight and older BF firmware.

  11. Danny

    i have the Matek F405 FC and cant connect to BlHeli32 suite im getting the :

    “Initialization of serial 1wire passthrough or 4way interface failed! Please check Betaflight revision for support of serial 1wire passthrough or 4way interface!”

    ive tried everything and i have same setup on another quad and no problems at all
    motors spin fine but the escs will not connect to Blheli32 suite

    any help?


  12. Bryan D Wolfe

    My ESCs program in BLHELI_32 fine, but when I use the motor tab in BetaFlight Motors 1-3 spin fine but NOT motor 4. The ESC LEDs are on, it reads and programs fine, swapped motors to a knowing working motor, swapped ESC from its original position of 1 to now 4 and same issue. Any idea what is going on?

    1. Oscar Post author

      The LED only indicates the ESC is getting power. My guess is that your motor output on the FC is bad..
      if you have a spare motor pin, use it.

    2. Dirk

      Similar issue here. With using dshot150 only motor 1-3 are spinning.
      BUT if I disconnect the receiver (MPX) everything works fine!
      So the XBUS_MODE_B seems to disturb the communication with the ESC. Also the motor setup with the suite does only work properly without receiver connected.
      Multishot is working also with receiver on…

  13. Oyvind

    Trying to connect to my Littlebee Summer 2-6s BLHeli_32 30A esc’s from the latest BLhelisuite. I am not able to load BLheli32 interface profile, Cannot read settings, or flash firmware. All motors spin in the motor test just fine. Also in Betaflight.. I have flashed my FC to Betaflight 3.2 RC4, so it should be fine. FC is Matek F405-AIO. Any ideas?

  14. Daniel

    My first comment here and would like to thank all the people that invest their time to make this site happen. I’m new to the hobby and many times this site guided me along through the steep learning curve for a beginner like me. Great job!

    I’m trying to test my motors using BF or BLHeliSuite32 but I cannot make them spin. Previously, on BF v3.1.7 I was able to go in motors tab and spin just 1 motor ( from 4 ). Later I discovered that ESCs where taking a lot of time to get “read” by BF as eventually I could spin 3 motors. I kind of gave up on the last as it was taking too much time.

    After the BF update and even on BLHeliSuite32, there is no way I find out how to make motors spin from the “motors” tab. On BF sliders are disabled and it won’t work on BLHeliSuite32, although it says that it can read setup for all motors. Is this bad and if so, is there any reason why this might be happening? I’m afraid something is wrong with my ESCs or my setup.

  15. casey hanke

    Anyway to do this with raceflight? I have the new skitzo board and im trying to get raceflight to see them

    1. Pyrolassist

      Am I also building a new quad with Skitzo (Raceflight) and was wondering the same? Has anyone successfully used BlHeli_32 and raceflight together?


Leave a Reply

Your email address will not be published. Required fields are marked *

Are you Robot? *

I only check blog comments once or twice a week, if you want a quick reply you can post your question on this forum You might get a faster response from me there (multirotor related only).