I'm stucking to crack polnav with polnav_kg,but all method are failed,how to use polnav_kg properly

another questions:how to make the arrow more large

Instruct:
1) Extract and copy folder Navi to sdmmc or residentflash
2) run polnav_kg.exe
3) write down device ID than exit program
4) using pc goto folder Navi\Map rename Your_Device_ID.key to "Rxxxxxxxxxxx.key" Rxxxxxxxxxxx = device ID
5) run polnav_kg.exe again than exit ( this step will generate new "Rxxxxxxxxxxx.key" in PolNav_6028_P18 folder )
6) using pc goto folder Navi\Map rename back "Rxxxxxxxxxxx.key" to Your_Device_ID.key for future use
7) using pc goto folder"Navi" move "Rxxxxxxxxxxx.key" to "Map" folder
8) run polnav_istts_release.exe
9) done

Anyone know how to make the arrow more large