Samsung Galaxy S III - International GT-I9300
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: Root my Samsung Galaxy S3 i9300?
There are more than one way that leads to Rome:Q2: How should I flash my custom ROM?
You usually flash ROM's in a custom Recovery. On the Samsung Galaxy S recoveries are situated on a separate partition. Unlike previous Smsung Galaxy S devices the recoveries for the Samsung Galaxy S3 i9300 is NOT part of the kernel. They can be flashed through ODIN or through another custom recovery.Q3: How can I return to stock ROM?
There can be a need to return to stock ROM, for example when you need to return your device for warranty. This one seems to be very frequently asked and @doovd made this great guide.Q4: What is ODIN?
Odin is a leaked tool from Samsung. It is used to flash firmwares to phones. There are more than one how-to's covering the use of Odin, this is one of them. Also found using the XDA WIKI.Q5: How do I unlock my bootloader?
On this device (actually, on all Samsung devices) there is no locked bootloader so there is no need to unlock it!Q6: I have heard about EFS. Why is this so important?
/EFS is a partition on your phone where your IMEI code is stored. Without it your phone is an expensive PDA. Make sure to have a backup of this partition on a separate device.Q7: I am looking for the best ROM, which should I choose?
ROMs come in two flavours. CM based ROMS and Samsung based ROM's. While CyanogenMod is completely open source, several derrivates come from it. AOKP, ParanoidAndroid and maybe more. These ROMs do not have the coodies Samsung delivered in their Touchwizzzz, like Svoice, Smart Stay and what not. On the other hand, they are gererally speaking more smooth.Q8: Where are the development options?
The choise is up to you. There is no such thing as the best rom, it is a subjective matter. Please, also read this sticky thread in the General section.
Since Android 4.2 they are hidden for the normal user. We, XDA users are NOT normal users . They show up after tapping 7 times on the build number under settings-about the phone-buildnumber.Q9: How to I enter Download Mode and Recovery?
Make sure your phone is unplugged and powered off.Q10: What is this 'Flash Counter' everybody is talking about?
Download Mode: Hold Volume down, home, and power until you see the green dude.
Recovery: Hold Volume up, home, and power for about 5 seconds then release all buttons. This might take a couple of tries.
Your phone's flash counter is triggered when it detects custom firmwares. This is Samsung's way of knowing that you have modded your device. But thanks to the awesome people at XDA, there are ways around this. Refer to This Thread.Q11: What is ADB and how do I use it?
Q14: I have searched everywhere and still can't find an answer to my question..?
Afer upgrading to JB 4.2 your forgot to upgrade your recovery. Older recoveries can't handle the multiuser support on the sdcards so your data got shifted to a 0 folder again and again, resulting in /sdcard/0/0/0.... etc. That is where your backups have gone too! In Titanium Backup's setting you can define the backup location. Point it to the correct location and get your backups back.
Have you really searched everywhere? Google? Asked in the thread of which your question pertains to? Read the stickies? If you have honestly spent more than 5-10 minutes searching for an answer, post a new thread in the q&a section.
A special thanks to everyone who contributed to the production of this FAQ