[Galaxy S III General] RoadXY:
I wanted to start a thread with the Frequently Asked Questions regarding the CM12 port of our beloved Galaxy S3 (GT-I9300)

Download

Latest version:

GAPPS download

Where can I download the latest GAPPS (Google Applications)?

https://s.basketbuild.com/gapps

Use the CM12 download link

Bugs

Known bugs:

smart lock with NFC crashes settings

Mobile network is always half the signal strength

Mute not working in calls

Message while flashing in recovery

I'm getting a message: "mount failed dev/block/mmcblk0p12 at /data: Device or resource busy"

That is because of the new type of flashing. It's still flashing though and takes a while. Be patient.

Bootloop

My device bootloops! What can I do?

Before thinking your device is bootlooping, give it at the very least 5 minutes, art takes a while to optimize during the 1st boot.

If that doesn't work, try philz latetst touch recovery.

Get it here

Download the .tar file if you want to flash using Odin.

Use the .zip file if you already have a custom recovery (CWM, TWRP etc)

If that doesn't work, get usefull logs.

See here...

Keyboard isn't working

[EDIT]

SOLVED IN BETA1!!!

Whaaa, I have no keyboard, whats wrong?

Enable "Hardware" on Keyboard settings

No 3G/data

No status bar

I have no status bar and no lock screen, whats wrong?

Did you flash any other kernel? Use stock embedded kernel (reflash ROM to use stock kernel)

Wifi problems

How can I get wifi working on my murata chipped S3?

Try this:

http://xdaforums.com/showpost.php?p=56938378&postcount=739

SD-card problems

I'm unable to use my SD card!

EXT4 and a variety of other filesystems are not supported.

Only FAT32 is supported up till now (until CyanogenMod supports the orther filesystems)

Root

I lost root!

Flash SuperSU in recovery.

Download:

http://xdaforums.com/apps/supersu/2014-09-02-supersu-v2-05-t2868133

CM11 features

CM11 feature 'x' isn't working anymore/missing, when is it available again?

Don't ask for features or ETA's.

The devs are doing this in their spare time FOR FREE!

If you can, you can try to help by learning how to build and code the features (see Building your own CM12 build for the i9300 below)

Changelog

Mainly only new CM12 commits.

Best and easiest what you can do is check this site: http://www.cmxlog.com/12

Dual boot

Can I dual boot this ROM?

Yes:

Extended tutorial with screenshots here

well you can only dualboot LolliPop if it is 1st ROM, i.e you can not use multiboot.zip to flash the alpha CM12 to 2nd ROM directly

you have to backup current apps on the ROM,

wipe data/factory reset from Philz Recovery provided by arter97,

install the Alpha CM12 zip,

then flash arter97 kernel (4.0-beta1),

then flash multiboot.zip followed by the ROM you want and restore your apps when booting in the 2nd ROM

BUT...

- You can't do phone calls (IMEI and Baseband was OK)

- You can't pull down the notification bar, I tried, tried, one finger, two, staring it... but don't... T_T

Because of arter97 kernel

Nameless 2.0 commits

I found the commits of Nameless, can we use it to get 3G working?

No, those commits aren't complete yet.

See here

Building your own CM12 build for the i9300

Start learning by following this tutorial here:

http://wiki.cyanogenmod.org/w/Build_for_i9300

Donate

Awesome ROM, where can I donate to help the devs buy some beer?

You can donate on all dev on their profiles, all have option "Donate to me". Also You can see this option below my avatar on ledt this post. But don't forget I'm not developer.