Firmware jz4740 how to disassemble?

Question

Do it yourself

Background: the device from DVTech pocket is a game boy toy. Connecting to a computer made it clear that he was on an Ingenic JX4740.
Digging on the Internet led to an article in "giktime" "saving and restoring firmware from a media player from a magazine" from uv. Odinokij_Kot. I downloaded the program Test_jz4740_usb.exe from uv.Tronix.
All operations were performed under Win10.
Did...................
So: command ndump 0 32768 0 0 fuul.bin
Got a 64 MB file.
The toy was successfully killed by pouring minios-1.0.39.
How to fill in the fuul.bin file now?
How to properly split it into loader.bin, def_boot.bin, img_boot.bin, minios.bin, res.bin.
Tell me please :-).
I am attaching this file .