AT&T Samsung Galaxy S 5
This a short list of frequently asked questions in this device forum and the answers often given as a response. It should serve as a starting point for gathering knowledge and finding solutions to many common problems. Please only post in this thread with feedback on how to improve this document. Do not post "Thank you" type responses. If you have additional questions or require more help, try to find an existing thread or create your own. Do not use this as a general help thread.
Q1: What are download mode and recovery and how can I enter them?
Make sure your phone is unplugged and powered off.
Download Mode: Hold Volume down, home, and power until you see the green dude.
Recovery Mode : Hold Volume up, home, and power for about 5 seconds then release all buttons. This might take a couple of tries.
Q2: What is ADB (Android Debug Bridge) and what is it for?
There is much to learn, please view everything in the threads OP, here is a very good guide [GUIDE] ADB Workshop and Guide for everyone
Q3: How to enable "developer options" in 4.4.2?
Go to->Setting->About Phone->Click 7 times on Build number
After this you will see a pop up message saying that you are now developer.
Q4: How do I root my device?
Thanks to @geohot TowelRoot **GS5 ROOT THREAD** TowelRoot
Q5: What are my choices on a custom recovery?
Q6: How can I Sim-Unlock my phone ?
Thanks to @Chainfire [APP][2013.11.04] RegionLock Away v1.3[ROOT]
★Since i used this across three different device it might work but Not Test it Yet until Root method release★
Q7: Am I required to backup my ROM before flashing anything else?
No you're not, but it is definitely a good idea and always recommended because if you don't do a backup and then something goes wrong, it means that you'll lose all your apps, data etc. It just saves a lot of hassle.
Q8: How do I return my device to stock / ODIN to stock?
Q9: How to get a logcat if I'm asked for it?
Here is a link for learning how to make a Logcat[UNIVERSAL][LOGCAT]How to get & read a logcat/ Troubleshoot your own issues!
Q10: What does MD5 checksum mean??
MD5 digests have been widely used in the software world to provide some assurance that a transferred file has arrived intact. For example, file servers often provide a pre-computed MD5 (known as Md5sum) checksum for the files, so that a user can compare the checksum of the downloaded file to it. Download MD5 TOOL CHECKER
Q11: What is the best ROM/kernel/modem??
Honestly, there is no "best". It's all based on personal choice. For example; I may like heavily customizing my ROMs where as you may like it to look at basic as possible. The best thing you can do is to just test out different ROMs/kernels/modems and see which you prefer.
Q12: I have an AT&T GALAXY S5 & what are my choices for modems?
Q13: I have AT&T what is the Access Point Name (APN) I need?
Name: ATT Phone (Some might have PTA in place of Phone)
Proxy: Not set
Port : Not set
User name: Not set
Password: Not set
Server: Not set
MMS proxy: proxy.mobile.att.net
MMS port: 80
Authentication type: None
APN type: default,mms,supl,hipri,fota
APN protocol: IPv4
APN roaming protocol: IPv4
Enable/disable APN: APN enabled
Q14: How do I restore a Nandroid Backup?
Enter recovery mode again and look for the ‘backup and restore’. Select restore and everything should go back to normal in a few minutes.If you choose the ‘Advanced Restore’ option, you can select which component of the backup to restore – like the boot, system, data or cache...Reboot to system. Your system is now restored and is exactly same as the time when the backup was made.
Q15: How do I edit my build.prop to get ATT 4G LTE?
ro.product.model> SAMSUNG-SM- G900A
Thanks to @s5freak in Here Post #210
Q16: How to Enable Native AT&T / T-Mobile WiFi Hotspot?
A special thanks to everyone who contributed to the production of this FAQ