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For more details, watch this video from Joshua Bardwell.
Download BLHeli Suite
BLHeli Suite is the software that will be used to flash our ESCs.
It is possible to use the Cleanflight/Betaflight passthrough method (flash ESC via the flight controller without having to use a specific USB stick). To do that, open Cleanflight or Betaflight but don't click on "Connect" (if you do that, the COM port won't be available for BLHeli Suite anymore).
Now, start BLHeli Suite.
Now in BLHeli, choose the appropriate bootloader from the "Select ATMEL/SILABS Interface". It should be either [E] (for SILABS) or  (for ATMEL). If you're not sure, you can search your ESC in these PDF files:
For example, Favourite LittleBee 30A ESCs are found in the 1st document: SiLabs.
Connect and read setup
Upgrade versionIf you click on , it will open a popup window showing the current version vs. the latest version available.
It will then show a similar screen:
Once the first ESC is flashed, the following confirmation will be displayed:
BLHeli Suite will then automatically go through the same process for the remaining 3 ESCs.
At the end of the process, the following summary is displayed:
If a motor doesn't spin in the right direction, you have 2 options:
- switch 2 cables (you need to unsolder and resolder 2 connections between the motor and the ESC)
- change the direction in BLHeli Suite, as follows:
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