Samsung Galaxy S3 (GT-I9300) Android 4.4.2 KitKat Custom ROM [Tutorial]

Pre-requisite (things to remember before the installation of custom ROM in the smartphone):

• Though custom ROM gives unrestricted powers (options) to the device, once installed, smartphone company's warranty stands void and will no longer be liable for future updates [warranty can be restored simply by flashing the device with stock-ROM].
• This Custom ROM has to be installed only on Samsung's 2012 flagship model GT-I9300(International model).
• Rooting of devices leads to complete data wipe out, so make sure to back all your personal data.
• User can back-up their data using Samsung Kies, but if you perform custom recovery via ClockworkMod (or TWRP or any other); it re-creates exact settings seen before installation.
• Remember to wipe Dalvik Cache before proceeding to ClockworkMod recovery mode.
• To Install ClockworkMod Touch Recovery v6.0.1.2 for Galaxy S3 GT-I9300,click here.
• Users make sure you have installed USB drivers on the PC to connect your Galaxy S3 GT-I9300 (users can download, here)
• Make sure your smartphone has more than 80-percent battery. 
• Samsung Galaxy S3 (GT-I9300) Android v4.4.2 KitKat Custom ROM Installation Tutorial:
• Step 1: Download .zip file of crDroid Android v4.4.2 ROM for Samsung Galaxy S3 GT-I9300 in to your PC.
  Step 2: Connect Samsung Galaxy S3 GT-I9300 to your PC via USB chord.
  Step 3: Then, place crDroid Android v4.4.2 into the phone's SD card memory. [User are advised to paste the .zip files in SD card root, not in any other folder]
  Step 4: Turn-off the device and disconnect from the PC.
  Step 5: Then perform the regular Recovery mode sortie, by press holding 'volume (up)', 'home' and 'power' buttons. 
  Step 6: After entering ClockMod Recovery mode, perform full data wipe, by choosing 'wipe data/factory reset' [Note: use Volume keys to navigate and power button to select options, while operating under Recovery mode]
  Step 7: Now, clear the cache memory by selecting 'wipe cache partition'
  Step 8: Then to go back to ClockworkMod recovery, and select 'advanced' and tap 'wipe dalvik cache' [Note: This step is optional, but many recommend this procedure so that user will not face boot loops or other errors ]
  Step 9: Again come back to main recovery screen and then tap 'install zip from SD card'
  Step 10: Then tap 'choose zip from sdcard' and go to Android 4.4.2 ROM .zip file in SD card and enter the installation process [Note: use Volume keys to navigate and power button to select options]
  Step 11: Once the installation is completed, navigate to '+++++Go Back+++++' and re-boot the device opting 'reboot system now' seen in the recovery menu.
  Now, your device (Galaxy S3 GT-I9300) would take minimum five minutes to complete booting process.
  Users then head to Settings >> select About phone to confirm the installation of custom Android 4.4.2 crDroid Custom ROM.