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Your default security phone lock code preset 00000000 / eight zeros You can easily reset your phone to its default settings. To reset your phone : Touch Menu > Settings > Phone > Reset Phone. At the All settings reset to factory defaults. Continue? prompt, touch Yes to reset or No to cancel. Enter your phone password, if prompted, and touch Confirm. After the phone settings have been reset, the Reset Phone done confirmation displays.

AT&T Samsung Exhilarate SGH-I577 can be updated to latest Android 4.4.2 KitKat. The upgrade is possible with the help of custom ROM PAC-man. The development team of PAC-man ROM finally introduced Android 4.4.2 KitKat based PAC-man ROM for AT&T Samsung Exhilarate SGH-I577. Which means, you can download and install custom firmware PAC-man to update your AT&T Samsung Exhilarate SGH-I577 to latest Android 4.4.2 KitKat. AT&T Samsung Exhilarate SGH-I577 comes with good hardware spec, hence is capable to run PAC-man smoothly. PAC-man ROM consist various features of Paranoid Android, AOKP and CyanogenMod. The link Im sharing is PAC-man nightly build. The good thing about nightly build is, you will receive update daily and bugs are fixed faster as well as new feature introduced regularly. Continue reading this guide to know how to install Android 4.4.2 KitKat based PAC-man custom ROM on AT&T Samsung Exhilarate SGH-I577.
PAC-man comes with various useful customization. Since, PAC-man is based on Android 4.4.2 KitKat, you may like to know whats new on it. Some of the cool Android 4.4.2 KitKat features that you will enjoy is Screen Recording, Tap to Pay (Google Wallet for everyone), NFC emulation for non nfc devices, 14% less memory usage, cloud printing from Gallery, Google Home is the new Launcher, Core System Processes Trimmed, apps are efficient and responsive on all devices, the all new procstats tool details memory use, Full-screen Immersive mode, seamless change in resolution during media playback, Phone dialer got local business detection, redesigned Quickoffice and many more.
Please note, not all Android 4.4.2 KitKat feature yet ported to PAC-man ROM.

Another thing you should note, this is nightly build, hence expect some bugs in it. All bugs and issues expected to be fixed as development progress towards a stable PAC-man build.
Warning!
This tutorial is only for AT&T Samsung Exhilarate SGH-I577. Don’t try this guide on any other Android device. Also, we (Android Pulp Team) are not responsible for any damage caused due to the instruction given in this page. Try this at your own risk. However, it is very unlikely that your device will be damaged if you follow all the instructions as it is which are mentioned in procedure.  
Pre Requisites:

1. ROM flashing require you to wipe your internal memory data, hence you required to backup your device data. You can follow our ultimate backup guide.

2.  Make sure your device have at least 60% battery power. If your phone shut down during installation then there is good chance to brick your device.You can install an app like Battery Notifier BT Free on your Android device to check it easily.

3. You must have USB Driver Installed for AT&T Samsung Exhilarate SGH-I577 in your PC. [Download USB Drivers]

4. Make sure USB Debugging is enabled otherwise its wont be possible to transfer file between PC and AT&T Samsung Exhilarate SGH-I577. [Guide].

5. Your device have latest CWM version 6.0.4.4 and up or TWRP 2.6.3.1 and up installed. [General Guide]

If you done everything that we mentioned above then you are ready to follow step-by-step guide on how to install Android 4.4.2 KitKat based PAC-man ROM on AT&T Samsung Exhilarate SGH-I577.

File Required(Download by clicking on it)

1. PAC-man For AT&T Samsung Exhilarate SGH-I577  [Filename: pac_exhilarate-nightly-20140514.zip]

1. Google Apps [Filename: pa_gapps-stock-4.4.2-20140207-signed.zip]

How to Install Android 4.4.2 KitKat based PAC-man ROM on AT&T Samsung Exhilarate SGH-I577

1. Connect your device to PC using USB cable and then copy downloaded files to the SD card of your device. Important: Don’t extract any files.

1. Disconnect USB and then turn off your AT&T Samsung Exhilarate SGH-I577.

1. Now, Boot into recovery mode. To do so, press and hold Volume Up, Volume Down and Power button together until Samsung logo flash twice and then leave the buttons. You should see recovery menu soon. In recovery use Volume Keys to navigate between option and Power or Home Key to select an option. Alternatively try this: Recovery Mode without Key Combination.

1. Perform a Nandroid backup of your existing ROM that you can restore later if this new ROM not work or you want to go back into your previous ROM. To perform a backup, select Backup and Restore, then on the next screen, select Backup again. Go back to main recovery menu after backup is complete.

1. Now, perform data wiping task. To do so, select wipe data/factory reset, then select Yes on next screen to confirm your action. Wait few minutes till the data wipe is complete. Now come back to CWM recovery main menu. Select wipe cache partition and after wiping process done, select Wipe Dalvik Cache under advance option to perform Dalvik cache wiping.

1. Select install zip from sdcard, then select choose zip from sdcard. Now, locate the PAC-man Zip file that you copied earlier in Step 1 and select it by pressing Power button. Confirm installation by selecting Yes – Install _____.zip on the next screen. The ROM installation will begin.

1. Once the ROM installation process end, repeat the step 6 but choose the pa_gapps-stock-4.4.2-20140207-signed.zip file instead of ROM zip to install the Google apps package.

1. When installation is completed, go back to the main recovery menu and select reboot system now to reboot your AT&T Samsung Exhilarate SGH-I577 and boot up into Android 4.4.2 KitKat ROM PAC-man. 

1. Returning to Previous ROM: To go back to your previous ROM, boot into recovery, select backup and restore then restore your previous ROM by selecting it from the list.

Tutorial For TWRP Recovery Users:

1. Connect your device to PC using USB cable and then copy downloaded files to the SD card of your device. Important: Don’t extract any files.

1. Disconnect USB and then turn off your AT&T Samsung Exhilarate SGH-I577.

1. Now, Boot into recovery mode. To do so, press and hold Volume Up, Volume Down and Power button together until Samsung logo flash twice and then leave the buttons. You should see recovery menu soon. Alternatively try this: Recovery Mode without Key Combination.

1. Create a Backup using TWRP Backup Option.

1. Perform a Factory Reset (this will delete all apps and their settings and game progress). To do this, Tap on Wipe, then at the bottom of the screen do a Swipe on the ‘Swipe to factory reset‘ option.

1. Now its time to add zip file for flashing. Tap on Install, then browse to the location where you saved the files and tap on the PAC-man Zip file. Then tap on Add More Zips, and add pa_gapps-stock-4.4.2-20140207-signed.zip. Now at the bottom of the screen, do a swipe on the Swipe to confirm flash option to begin flashing.

1. When installation is completed, go back to the main recovery menu and tap on Reboot and then, tap on System to reboot your AT&T Samsung Exhilarate SGH-I577 and boot up into Android 4.4.2 KitKat ROM PAC-man.

1. Returning to Previous ROM: To go back to your previous ROM, boot into recovery, select Backup then through Restore option, restore your previous ROM by selecting it from the list.

Congrats! Android 4.4.2 KitKat firmware based custom ROM PAC-man is now running on your AT&T Samsung Exhilarate SGH-I577. Now explore the latest Android 4.4.2 KitKat. [Note: If you find difficulties to run root only apps then it may be disabled. Do this then, enable developer settings first (tap the build number 8 times under about device), then enable root under Developer Settings].