Mythology of Blue: 【ROOT】/【UNROOT】/【Install CyanogenMod】 for Samsung Galaxy Ace S5830

To begin, Rooting is the process whereby one can gain advanced control over their devices.

Advantages of ROOTING:

Delete unwanted apps
Expand system memory
Theming your device
Moving apps to SD-Card
Installing Firewall
many more

But the disadvantage which follows is:

WARRANTY BECOMES VOID (you can always gain it back by installing Official Firmware)

P.S: I am not responsible for anything which goes wrong. The process mentioned has been tried several times and is universally recognized. Therefore if anything goes wrong it'll be Your and solely your fault.
PS: This Rooting method is only for people on 2.3.x Firmware i.e GINGERBREAD. Pls do not follow this if you are on Froyo.

Now to begin with the process of Rooting:

Download the file update.zip to your PC
Copy it on your SD Card.
Switch off your Galaxy Ace.
Once off, press HOME and POWER button until you come to a screen like this.
Using Volume Up and Down key select Option APPLY UPDATE FROM SDCARD. Press HOME key to select the option as touch won't work.
Then select CHOOSE ZIP FROM SD CARD.
Now select the file you downloaded her.
After installing finishes go back and Reboot Device.

Congrats you have finished rooting your device.

To UNROOT
Simply download Unroot.zip and follow Steps 2 to 5.

Install CM for Samsung Galaxy Ace (cooper)
Note: DISCLAIMER
Modifying or replacing your device's software may void your device's warranty, lead to data loss, hair loss, financial loss, privacy loss, security breaches, or other damage, and therefore must be done entirely at your own risk. No one affiliated with the CyanogenMod project is responsible for your actions. Good luck.

Installing a custom recovery

Download ClockworkModRecovery kernel (Applicable to Gingerbread only)

Recovery kernel for Galaxy Ace: download
md5: ba3d09df567757081da5dd6e8fb2d0b0

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.
For the instructions following after this, the phone needs to be turned ON (either normally or in CWM Recovery).

Installing CyanogenMod from recovery
Note:
Some devices do not have removable SD cards. Regardless, there should still be a partition on the device named "/sdcard" that can be used for flashing purposes, even though the contents of /sdcard may actually be in internal storage.

Download the prebuilt release of CyanogenMod you wish to install. (Or if you've built CM yourself, look in the $OUT directory for the .zip.)
Optional: Download any supplemental 3rd-party applications packages for the device you wish to use.
Place the CyanogenMod rom .zip file on the root of the SD card using adb:

Transfer your file(s): adb push YOURROMZIP.zip /sdcard/

If you boot directly to recovery and have an internal sdcard, you may need to run adb shell mount /sdcard or mount data through the recovery menu before transferring.
If you see "error: device not found" there is likely a driver issue on the PC.
If you see "error: insufficient permissions for device", try "adb kill-server" and then run "adb devices" to see if the device is attached.
On some devices, the zip file can be copied to the device using standard USB Mass Storage or MTP support. Boot the device normally and transfer the file to it.
Optional: Place any supplemental packages (e.g. Google Apps or kernel) .zip file(s) on the root of the SD card.

Boot to recovery mode on the device by holding Home & Power button until Samsung logo appears, then release Power.
Once the device boots into the ClockworkMod Recovery, use the physical volume buttons to move up and down. On most devices, the power button is used to confirm your selection, although for some devices the power button is used as a "back" button to go up one level, in which case the home button is used to confirm the selection.
Optional/Recommended: Select backup and restore to create a backup of the current installation on the device.
Select the option to wipe data/factory reset.
Select install zip from sdcard.
Select choose zip from sdcard.
Select the CyanogenMod file you placed on the sdcard. You will then need to then confirm that you do wish to flash this file.
Optional: Install any additional packages you wish using the same method.
Once the installation has finished, return back to the main menu, and select the reboot system now option. The device should now boot into CyanogenMod.