![]() ![]() Unlike desktop and laptop computers, Particle devices only run a single user application at a time. Separating the two makes upgrading the smaller user firmware quick and easy allowing for rapid test and debug cycles, even when programming firmware over cellular networks. The user firmware is the part specific to your product or application and is typically the code you've written in C/C++. Device OS contains the code necessary to communicate with the hardware on the device (including cellular or Wi-Fi radios), as well as the Particle cloud. Most applications consist of two parts: Device OS ("system firmware") and the user application ("user firmware"). ![]() Device OS Versions, Upgrades, and Downgrades Introduction ![]()
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