1. Download tools from HERE
2. Extract rar files in one folder with rom file diskimage_Ver.nb0
3. Install Hex Workshop 4.2 (hw32v423.exe) on your PC, or u can using another hex editor. But i'm personaly like this software.
4. Typed command RomMaster.exe diskimage_ver.nb0 -w 5 -b 0x0018000c -x -o xip.bin. It's will generated xip.bin for you
3. Run xipport, choose dump xip.bin and write maps. Close xipport
4. Prepare your own image with size 240x320, flip and rotate it 180 degrees. It's will look like screenshot. Save as bmp, file size must be 230.454 bytes. If u have Corel Paint Shop Pro Photo X2, it will save with this size automatically.
6. Open S000 from nk.exe region on your dumped xip folder with Hex Workshop. ctrl+F On your keyboard and on pop up windows choose text string, on value typed bm6, and ok. Select Edit on top left and choose Select Block. On pop up windows set block to 230454, Dec for decimal, and on method choose size of block. Paste in black area, than save. Select yes if program ask to make backup of S000 and move backup file to another location (for sometimes u want restore your boot screen). See at screenshot
8. Flash your new rom to device
ps: Follow this step to changes Hard Reset Screen on S003 from nk.exe region
Weel done, i hope this thread will help u