This guide will walk you through the process of taking the Samsung Galaxy Ace from stock to having the ability to flash the latest version of CyanogenMod. This guide assumes the Samsung Galaxy Ace already has Android 2.3 installed on it.
Note: The official Android 2.3 update from Samsung must be applied before following this guide.
Before you do anything — Make a backup
Don’t forget to back up your data. If you have synced the device with a Google account, then the contacts, calendar, Gmail, & select other Google-related data will not be lost and will come back after the next sync. However, you should backup anything you want to keep that is not stored on the SD card:
Once the CWM zip file is downloaded, place it to your sdcard.
Now reboot in recovery mode by holding Home & Power buttons.
Select Apply Update from SDcard and select the CWM zip file placed in your sdcard.
Restart. For verifying, go into recovery again. You will find that recovery has been updated to CWM Recovery.
If the Samsung Galaxy Ace has been rooted, unlocked, etc. through steps other than the method described above or running a custom ROM other than CyanogenMod and you are having issues flashing or booting CyanogenMod, it is recommended the Samsung Galaxy Ace be returned to stock & start over with the full instructions provided above.