There is this guide to backing up firmware
There is an easier way for those who want to use SP only
This guide is only for those who have scatter for their device.
1.Open the SP Flash Tool software
2. Open the software folder and open the option file using Notepad.
Go down to this line:
Instead of false write true
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Open the software, select the scatter and go to the readback tab.
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Select the files you want to back up, click on the path to save the file, choose the name for the file and save.
In the window that opens, click OK without changing anything.
- Click read back and connect the device when it is turned off to the computer and wait for it to finish.
And that’s it, the backup is complete!