The official firmware V220.127.116.11.bin for Ender 3 Max printer.
According to Wikipedia, firmware is a specific class of computer software that provides low-level control for a device’s specific hardware. Appliance, like microwave or smartphone, needs firmware to achieve different functions. firmware is like an operating system on a device.
Firmware sometimes may have bugs or out of date. In many cases, users want to update an appliance’s firmware in order to solve a problem, get new functions, or for any other purposes.
Most 3D printers, as one type of appliance, also have the firmware to achieve the Human-Computer Interaction and control all the electronic components. With the development of 3D printing technologies, the firmware is improving as well. Therefore, updating (flashing) firmware to a newer version becomes a need for many 3D printer users.