Hopefully you've seen my announcement here about the 'performance edition' of the betaflight target for Onmnbis F3 flight controllers as used in the Leader 120 and pretty much every other micro quad that runs an F3 board with OSD (including the Emax Babyhawk R and MANY others). This differs from the stock version offered bia the betaflight configurator in that it includes the fatastic new features that made betaflight 3.5.0 really shine - iterm relax and rc smoothing in particular plus the return of LED control. These were openly available for betaflight 3.4.0 but not for 3.5.0 until sbstnp kindly re-compiled for the community and shared on RCGroups.
Further to this I've installed on my recently revised Leader 120 and confirm that it does indeed allow these important features that were otherwise unavailable - see below.
How to install
I'm going to assume that if you are reading this you kinda know how to update betaflight firmware on your quad so will take a few liberties. Firstly, download and unzip the file below to your desktop. Please note this version is only suitable for FRSKY receivers - leave a comment if you want me to link FLYSKY or spectrum too.
Next, go to the firmware update page in betaflight configurator (preferably configurator 10.4 on) Choose "Load Firmware [local]" and choose the unzipped hex file from the first step. If things grind to a halt here run the Impulse RC Driver Fixer to allow your computer to access your FC DFU
That's kind of it, you're done. Now you can enable all of the options that made 3.4 a real improvement for larger quads plus the improved dynamic filter from 3.5.0 which is more sympathetic to micros and the new feedforward system that allows you to better control the 'feel' of the quad without having to mess with PIDs so much. I'd strongly recommend reading the tuning guide for betaflight 3.4 and the tuning guide for betaflight 3.5 since there are many new features that improve flight performance. Just a quick note you can run Gyro/PID loops at 8k/4k with all new features on at 48% CPU and 4k/4k at <20% CPU as below