To replace the splash screen logo with your own you need platform builder to recompile the bootloader to get the custom image embedded in the code. The logo image code is BOOTLOADER\Display\bsp_logo.c
I once added the WiFi function on IMX53 SMD WinCE7 OS. In the Catalog Item, choose CoreOS ->Windows Embedded Compact-> Shell and User Interface -> User Interface ->WiFi setting, then Rebuild the BSP and get the new kernel.After burn the kernel into the SDMMC, power on the platform in control panel ,can find the corresponding settings. But now cannot remember so clearly. so you may have a try!