How to copy android system files?

Have you experienced copying system files, reboot and nothing happen? Unable to replace system files?

One major problem is you did not mount system folder to Read and Write!

Your phone must be fully ROOTED!
After running Root Explorer and inside the system folder. Remember to click on the MOUNT R/W.
If you do not mount it to Read/Write you will not be able to copy new files.

You should have this error message if you did not mount it. Others File Explorer might just show pop-up message and gone... this is another problem. You might not see the message.

Make sure Root Explorer allow in SuperUser! If not, you will not be able to access system files will full right.

Once copied. Remember to set permission. Normally to "rw-r--r--".

REBOOT! New system file will only executed after reboot.

NOTE:
Make sure you rename existing system file to BAK before copying new file! Else you might end up asking around for original file :)

Samsung KIES for windows

Download KIES 2.1.0 here...

Why should I have KIES??

• Connect mobile without wires

  Connect a mobile to Kies via Wi-Fi and Sync content.
  Kies via Wi-Fi lets you enjoy Kies in a remarkably convenient way.
  * It is available for the supported models only, and some functions are limited while Wi-Fi connection.
  

• Keep your mobile updated

  When connected, Kies automatically notifies you of new firmware version.
  Make your mobile improved with the latest firmware.
  

• Sync contacts with Outlook or Google, Yahoo

  Add and edit contact of mobile on Kies conveniently. Also, sync contacts with those of Outlook, Google or Yahoo.
  

• Enrich music life with mobile

  Make your own favorite music playlist and Sync with mobile. All the music want to listen to entertain you wherever you are.

• Keep taken photos and videos from mobile to PC

  Safely store valuable photos, videos you’ve taken and feel your happy moments in Kies.
  

Note:
-To run ODIN and execute it successfully, you need to KILL all KIES process inside Task Manager.
KIES and ODIN cannot run at the same time.
-Latest firmware update base on region. Malaysia sometime a bit late in software update. Be patient.
-For technical guy you may continue update base on the leaked ROM.

Remember to restart after KIES installation. This to make sure all the drivers installed and configured properly.

 Running on Windows 7 64 bits

All ready... :) ...I'm using Hong Kong version ZSKK1 2.3.6

USB drivers connected ready for file transfer between PC and phone OR become a modem for Tethering.

KIES in task manager

Things you can copy from phone to PC or PC to phone.

Things you can back-up

You can Sync.... KIES improve much from previous version... more integrated with your PC... This is good for PC users.

 Connect KIES via WiFi

 Run KIES on your PC first.

Ready to Sync over the WiFi...