Web RNode flesher: need a button (or help link), to save the current(old) firmware

[badrussians]

I don't understand how to upload RNode-firmware to any RNode board...
But this issue #17 worries me: Unable to flash Meshstatics
(I also ask to pay attention to my comment in this Issue).

At liamcottle.github.io/rnode-flasher
in the Advanced Tools section,
there's a "Dump EEPROM" button and it says "EEPROM dumps are shown in the dev tools console."
What is this and how to use it - I don’t understand!

I'm not an experienced user of RNode board flashing,
but I definitely want to be able to save the old firmware, already written to the board,
and restore it if needed, using the website liamcottle.github.io/rnode-flasher
Personally, I don't understand how to do this (write and restore old firmware).

So, please expand the functionality of this website,
so that it's possible to download old firmware from the board and upload old firmware to board from file...
Or provide a link to information on this website that explains how to do this!
And need a threatening message suggesting to save the old firmware to a file and download this file before flashing!