From XDA-Developers

Model Number: SGH-T679 (T679M for Bell Mobility)

Specification

Manufacturer:	Samsung
Release Date:	October, 2011
Operating System:	Android
Dimensions:	115.5 x 59.8 x 11.5 mm
Weight:	3.9 oz
Chipset:	1.0 GHz Scorpion CPU, Adreno 205 GPU, Qualcomm MSM8255 Snapdragon
Display:	3.7" WVGA 480x800 SC-LCD
Networks:	GSM Quadband; 850/900/1800/1900MHz UMTS (AWS Band 4): 850,1700,1900,2100MHz, Bluetooth 3.0, GPS
Wifi:	Not Known
Bluetooth:	3.0
NFC:	Not supported
GPS:	yes
Video out:	Not Known
Camera:	3MP (2048x1024) Auto-Focus with LED Flash
Secondary Camera:	VGA, 640x480
Internal Memory:	512MB RAM, 2GB ROM (365MB appspace, 1.07GB userspace)
Memory Card:	up to 32GB micro SDHC
Battery:	Li-ion 1500 mAh Talk time: 2G/803 min, 3G/393 min. Standby time: 2G/750 hrs, 3G/576 hrs.
Additional Features:	GP2A Proximity Sensor, AK8975 Magnetic Field Sensor, AK8975 Orientation sensor, BMA222 Acceleration Sensor, GP2A Light Sensor, Gravity Sensor, Rotation Vector Sensor

Introduction

The Samsung Galaxy Exhibit 4G (AKA Exhibit II 4G (codename: Ancora/Ancora_TMO for CM9)) is sold in the United States from T-Mobile on both its contract and Monthly 4G prepaid plans. The Galaxy Exhibit is the successor to the original Samsung Exhibit & is a variant of the Samsung Galaxy W. Under the hood it features a Qualcomm Snapdragon with 512 MB of RAM. The Galaxy Exhibit also features a 3.2 MP camera with LED flash as well as a front facing camera for photos and video chat.

Rooting

You can root the Samsung Exhibit II using SuperOneClick & ZergRush. This method is reported to stop working after performing an OTA update.

An alternate method of rooting is to flash jocala's custom kernel. Flashing this kernel also installs Superuser, busybox & ClockworkMod. This method works with all firmware versions.

Safe To Remove

AnalogClock.apk
Browser.apk(Only if you use an alternative browser i.e. Opera Mini, Dolphin Browser/HD, Firefox)
Dlna.apk
DownloadProviderUI.apk
DualClock.apk
IQ-tmobile-release-signed-zipaligned-v1.1....
JobManager.apk
KiesAir.apk
MobileBackup-unsigned_v3.3.02.apk
MyFiles.apk(Only if you have an alternative File Browser i.e. Astro File Manager. Note: If you remove MyFiles.apk, you will be getting an error when assigning ringtone using 'Select sound from My files')
SamsungWidget_Program...
Swype.apk
TetheringManager2.apk(Only if you don't use T-Mo's tethering service)
TouchWizCalendar.apk
TouchWizCalculator.apk
TwCalendarAppWidget.apk
VideoPlayer.apk(Only if you have an alternative video player i.e. Mx Video Player)
VoiceRecorder.apk
WiFi-Calling.apk(If you don't use it)
ZinioSettingsProvider.v2.03.3331.TMobile....
sihome-signed-tmo-android-8.apk
talkback.apk
tmobile_m4m_3_0_15.signed...
vvm-signed.apk
411 & More
AllShare
Bejeweled 2
Bonus Apps
Calculator (you will need to get another one if you use it)
Home screen tips
Kies air
LiveWallpapersPicker
Lookout Anti-Virus
Media hub
My Account
More for Me
News and Weather widget
T-Mobile TV HD
Telenav GPS Navigator
Tetris
TwWallpaperChooser (Don't remove if you like those stock wallpaper apps)
Video Chat
Visual Voicemail
Yelp
Zinio Reader

Recovery

TWRP touch recovery ported by smartguy044 HERE

ClockworkMod (by Koush) is an alternate recovery for Android phones. It allows you to make nandroid backups of your Exhibit, as well as offering utilities to troubleshoot problems.

Download standalone ClockworkMod 6.0.1.9 HERE

CWM 6.0.1.2 is also available as part of jocala's custom kernel HERE

Both ClockworkMod and the custom kernel/ClockworkMod combo can be flashed from Samsung's stock recovery. If you are flashing from stock, be sure to copy the zip file to your internal sdcard. Samsung's recovery will not detect the external card.

Easy way to start stock recovery

Pull the battery from your phone.
Connect phone to your pc via usb.
Press & hold Volume-up
Insert battery

Both archives above contain a file called "recovery.img." This recovery.img file is actually a combined kernel and root file system with the program /sbin/recovery being the actual ClockworkMod program. If you like, you can also extract the recovery.img file from either of the two zip archives above and flash via the command line.

(command line can be a rooted adb shell or a rooted terminal on your device)

cd /path/to/image

dd if=./recovery.img of=/dev/block/mmcblk0p13

From a rooted terminal, "reboot recovery" to start ClockworkMod. From your computer the command "adb reboot recovery" works too.

To start Recovery (ClockworkMod) from power-off.: Press & hold Vol-Up, then press & hold Power. Shortly after the plain white Samsung logo appears, release both buttons. ClockworkMod should start after the color Samsung/T-Mobile Exhibit II logo.

CWM Keys: Home key = enter Back key = back VolUp/Dwn = highlight choice

Flash Back to Stock

Flash to stock via ClockworkMod

Download uvlg3.flash2.stock.zip - Copy to sdcard. Boot into ClockworkMod. Flash file. That's it, phone is stock. Wipe Data/Cache/Dalvik prior to reboot.

Flash to stock via Odin

Thanks to stubbakatt for the original back to stock directions.

DISCLAIMERS:

This works with Windows XP/Vista/7. It also works with Win7 running via VMWare Fusion on Macs running Snow Leopard and Lion.

FILES NEEDED:

Download Odin (Google it) and the stock factory images: uvlg3.odin.zip

Samsung USB Drivers: click here - if you're rooted/rommed, you probably already have these
Samsung Drivers for "Download" mode: click here or click here - if phone is not recognized by PC when in Download mode

STEPS:

Odin does not reset /data, so do a factory reset - this will wipe out the /data partition,leaving you ready to flash back to stock. If you don't do a reset, your stock install most likely will not work.

Make sure the computer recognizes your phone with the drivers above (again, this is probably already the case if you're having to do this!)

Unzip the uvlg3.odin.zip to wherever you want - preferably somewhere easy to get to (desktop?).

Power down your phone. Once it's off, hold down the volume-down button and press power. Hold both down until you see the "Warning!!" message with the yellow triangle at the bottom. Once you see that, hit the volume-up button. This puts you into Odin/download mode.

Plug your phone into your computer.

Open "Odin Multi Downloader v4.43.exe". Once it opens, the Message window at the bottom left should read "Added!!!" and "Detected!!!".

Make sure all four of the Options are checked (One Package, Auto Reboot, Protect OPS, Reset Time [mine's set to 300 seconds]). I don't know if this is all necessary, but at the very least One Package and Auto Reboot appear to be.

On the right side, click the "OPS" button, and select/open the Ancora.ops file.

At the bottom, click the "One Package" button, and select/open the "T679LG3.tar" file.

The Message window should do an md5 check and end with "Check MD5... ok". If it doesn't, try redownloading again - don't want to flash a corrupt file!

If all of that is good to go, then select the "Start" button.

Your mileage will vary, but it should take around 5 minutes, then the phone reboots itself into recovery mode (the little white box with the progress bar), then about 30 seconds after that and the phone fully reboots. Don't unplug it yet. After a few minutes (actually, the 300 seconds set in the "reset time" in Odin), it will say "Pass!!!" and you're good to go and can unplug the phone.

You should now have a phone that's identical to when you pulled it out of the box.

swap sd and external_sd

Eriks Pigoznis for the Galaxy W, and jliles @ xda for cm9 on Exhibit II edited vold.fstab to swap sd & external_sd and it works great. The app linked below should work on any stockish Galaxy Exhibit.

SwapSD App For stock ROMs, also tested with RebelROM.