Looks like it might be possible to mod the Onda vx747 with version 1.0.1.0 of dancemammal.
I just created this small .lst file and loaded it together with v1.10 firmware to mod the palm trees background on the player.
You need to untick "Image Bit Swap" to display the picture correctly in dancemammal.
There is no option to save the firmware as .HXF so I saved it as .bin and then just renamed the extension back to .HXF
Not able to test as I don't have this player, but as long as the updater accepts the firmware changes then it should work. ☺
// RockChip Editor File
// Editor Ver 1.0.0.0
// Created By Dancemammal 2007
//Header
Chip=JZ4740, Chinachips chipset
MName=Onda,001,
PName=VX747
Version=1.10(20080130)
DefaultOffSetB=9859288
DefaultOffSetT=(default)
OInf1=ShortDesc:VX747
OInf2=(none)
ItemCount=0
//Items
ItemName=ItemName
ShortDesc=Desc
ItemDesc=Description
ItemID=1
ItemType=1
SubType=0
ItemFlag=0
ItemRect=0,0,320,240,
OffSet=0,0
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