These are instructions on how to root Samsung Galaxy S2 HD LTE SGH-I757M (running on android 2.3.6, build id GINGERBREAD.UGLCA) using Odin on Windows Computer.
Requirements: Your Samsung Galaxy S2 HD LTE SGH-I757M should have at least 30-40 percent of battery to perform the rooting process.
Optional: You can also verify the root status of your device by using the Root Checker App.
[*] Warning: The above tutorial only works for Android 2.3.6 with the built id GINGERBREAD.UGLCA.
[*] If your device isn’t running on the same built id GINGERBREAD.UGLCA, then you may need to download and flash (install) the firmware based on the same build id. Later try to root your device from the above method.
[*] No data loss process: Your data including contacts, pictures, videos, music wont be affected using the above method. In short, no data loss process.
[*] Samsung Stock Firmware: If you are looking for the original firmware for your device, then head over to Download Samsung Stock Firmware page.
[*] Samsung USB Driver: If you are looking for the original USB Driver for your device, then head over to Download Samsung USB Driver page.
[*] Big thanks to Chainfire for their CF Auto Root file for Samsung Galaxy S2 HD LTE SGH-I757M. Without using the CF-Auto Root file, the above tutorial was not possible.