Create a Custom ROM - Android

Things needed:

• ADB
• Root Explorer (If you have it)

• Get all the files you want to have pre-installed in the ROM.
• Start the command prompt

• Use this code to put them in "/system/app" if you are using ADB.

Code:

adb shell
su
mount -o remount,rw /dev/block/stl9 /system
exit
exit

adb push nameofapk.apk /system/app/

• Delete all the files you don't want to have pre-installed in the ROM.

Code:

adb shell
su
mount -o remount,rw /dev/block/stl9 /system
rm /system/app/nameofapk.apk

• When you are done and satisfied with modifying the system, use this code in command prompt.

Code:

adb shell
su
mount -o remount,rw /dev/block/stl9 /system
dd if=/dev/block/stl6 of=/sdcard/factoryfs.rfs
exit

• After you do that, use Total Commander to replace the freshly created factoryfs.rfs on the sdcard in an existing .tar file.
• Flash your phone with the tar file to see if it boots.
• If it boots, Congratulations. If it does not boot, try again.
• If it still doesn't work, ask me some questions.