Update ODROID-X2 firmware and install GMS.

1. Download Android_Beta 1.6 firmware

http://com.odroid.com/sigong/nf_file_board/nfile_board_view.php?keyword=&tag=&bid=182

http://dn.odroid.com/Android_Beta_1.6/X2/emmc_installer_for_odroidx2.zip

2. write to SD Card.
sudo dd if=./emmc_installer_for_odroidx2.img of=/dev/sdx

or

ImageWriter

3. write to eMMC

4. success to install Android Beta 1.6 version

5. Download GMS apps.

Must download gapps-jb-20121011-signed.zip,

6. Download Astor File Manager apk and install

https://dl.dropboxusercontent.com/u/4485660/Astro%20File%20Manager.apk

7. Make updater directory and move gapps-jb-20121011-singed.zip there.

8. Settings -> About tablet -> ODROID Update.

9. Update

10. Sing in  Google Account.

11. Download Android Beta 1.7 firmware

http://dn.odroid.com/Android_Beta_1.7/X2/eMMC/odroidx2-ota-eng.codewalker.zip

12. move odroidx2-ota-eng.codewalker.zip to updater directory.

13. Update

13. Reinstall GMS apps

go back step 7.