How can you backup the firmware installed on a device?

ESPHome
1

I have a “working” device. I suppose if I’m afraid of losing it I should not overwrite it. But is it possible to read an existing firmware and write it to a .bin file?

2

Do you have the yaml file used to build the device?

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3

You can use esphome compile [filename.yaml] to output the compiled firmware files. Then just save those files for whatever future disaster you are worried about.

3 Likes
4

True - which is why I asked if they had the yaml. If you don’t have it, you can use esptool to download the firmware off the device.

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5

Connecting device to PC with Python+esptool installed - by using smth like this:

esptool --baud 115200 --port COM<X> read_flash 0x00000 0x100000 1Mb.bin
esptool --baud 115200 --port COM<X> read_flash 0x00000 0x400000 4Mb.bin