The Flipper Zero relies to the FreeRTOS running system. This is a true-time running technique kernel for microcontrollers which was designed back in 2003 and distributed under the MIT license. I take advantage of this feature on a regular basis to test remote controls that I've fixed right after battery https://martinclrek.tinyblogging.com/5-tips-about-flipper-zero-setup-you-can-use-today-80037456