I think you can use dd in terminal to write it. Splash partition is /dev/block/mmcblk0p18. You can also modify the updater-script inside the flashable zip in the first post according to that if you want to use cwm to flash it.
KonstaT any way to flash a new splash image? the stock one is jaggy on the edges and ugly! I got the perfect one to flash but fastboot flash splash splash.img told me theres no such partition
Size of the splash.img in the stock ZTE updates raised little suspicion so I hex edited it a bit. After the regular 565 bitmap there's another image.
ztesplash.png 1.82KB 32 downloads
Looks like one of the images that are displayed while offline charging. I'm not sure if it's used for anything but I think it was worth mentioning. Changing splash image should be quite safe and you can restore the original easily anyway.
Well yeah, there's one initlogo in ramdisk that is displayed after the splash image, but that's only in stock ROMs.
maybe its in kernel?