[Brka]

Full readback rom can be written via "Write memory" option,
Pressing CTRL + ALT + V in spft, then drop-down menu "Window", and select "Write memory".
New tab will appear, where you can select readed file, and start address for writing. (0x0)

Or ...

If you want scatter-like files ...

Check in SPFT folder for file named "Option.ini".
Open it in notepad++ , find this :

[ReadBack]
ShowByScatter=false

change false to true, save file, restart SPFT.
Load desired scatter file for your phone.
Now, in readback you will have all partitions, named as in scatter file.
You can select what to read, double click each row to select save location and file name.
Rest of procedure is same as for full rom_0 readback.

File naming must be in order with scatter naming,
or otherwise, to use such readed files,
you will need to edit scatter file itself, and manually put each partition name.

ie - standard naming :
system.img
lk.bin
preloader_xxxxxxx.bin
secro.img
logo.bin

etc.

Best idea - find similar or same stock rom,
to see name of files in that package.

p.s. If scatter-type rom readback is made,
and writing of files fail - means that factory flash files are SIGNED,
and readback you made can not be used.
However, in such case, full rom_0 backup still can be written via Memory Write option.
That's why it is more usefull imho.

b.r.
Alex