Update firmware if nodemcu

What is the procedure to change upload firmware in nodemcu? Is there any special tools ? From where which place we find those files which we will upload in node mcu?

Are you asking about uploading application software or maybe the bootloader ?

Bootloader who contains .bin files
I saw a video in which they upload .bin files using flash tools ?
But what are the official tools and from where we find actual .bin files , so we can update nodemcu with newer version.

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