Hi @FerdiCakmak,
This voltage spike is only significant when testing a thruster in air and almost all braking in being done by the ESC. We’ve tested for voltage spikes with an oscilloscope with a thruster running underwater, and there the water stops a thruster almost immediately so there is no braking to be done by the ESC. Underwater in actual conditions, the voltage spike from the ESCs is significantly reduced, and is unlikely to affect other instruments. That being said, we are working on disabling it anyway, but there are some hurdles to overcome. It looks like we need to compile our own fork of BLHeli_S to do this.
-Adam