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CyanogenMod is a free, community built, aftermarket firmware distribution of Android 5.1.0 (Lollipop), which is designed to increase performance and reliability over stock Android for your device.

CyanogenMod is based on the Android Open Source Project with extra contributions from many people within the Android community. It can be used without any need to have any Google application installed. Linked below is a package that has come from another Android project that restore the Google parts. CyanogenMod does still include various hardware-specific code, which is also slowly being open-sourced anyway.

All the source code for CyanogenMod is available in the CyanogenMod Github repo.

Device-specific source code for the Samsung Galaxy Grand Duos are available from https://github.com/pawitp/android_device_samsung_i9082 and https://github.com/pawitp/android_kernel_samsung_i9082.

Compatibilitiy Patches: https://gist.github.com/pawitp/88a1d4514a0734c866c7
(Please give credit if you use them in your ROM and if you fix something, please submit patches.)

Do not submit bug on CyanogenMod issue tracker

Downloads
ROM: http://goo.im/devs/pawitp/i9082_cm12.1 or http://d-h.st/users/pawitp/?fld_id=44634 or https://s.basketbuild.com/devs/pawitp/i9082_cm12.1/
Google Apps: http://d-h.st/users/dhacker29/?fld_id=27426 (use the one named "lpmr1")

What works?

• Wi-Fi


• Bluetooth


• RIL (Calls, SMS, Mobile Data)


• Dual SIM


• Sensors (Accelerometer, Compass, Light, Proximity, etc.)


• Camera (photo)


• Video playback


• Audio (playback & recording)


• GPS


• Everything else not listed under "known issues"

Known Issues

• FM Radio does not work


• Sometimes wake up causes music stutter


• Unable to un-pin screen without rebooting


• Some users have reported issues with call audio (see FAQ for a possible fix)


• Some users have reported low volume when recording video


• Does not work on 4.1 stock ROM's bootloader, please upgrade to stock 4.2 before flashing

Additionally, Dual SIM has the following limitations:

• Both SIMs are always enabled (no way to disable one SIM)


• "Receive incoming call while data is enabled" is always enabled

Installation

1. Make a backup!


2. If you were on CM 10.1 or a stock ROM prior to 4.2, upgrade to stock 4.2 first.


3. Install ClockworkMod recovery with SELinux support (.tar) (.zip). Older CWM will result in a "status 7" error.


4. Reboot into recovery


5. Wipe data if coming from stock or another non-CM ROM (You may get a "staus 7" error if you fail to wipe.)


6. Install the ROM


7. Optionally install the Google Apps Addon

To upgrade to a newer build, simply flash the zip. There's no need for data wipe or flashing Google Apps again. (However, if you are experiencing strange issues, you may want to try a wipe.)

Changelog
20150405: Initial release

FAQ

Sometimes the people on the other side of the call cannot hear me
The real cause of this is unknown, but this is often found with people using the I9082DDUBNB1 baseband/modem. Some people have reported that flashing a different baseband (e.g. I9082XXUBMK3) has resolved the problem. A collection of basebands can be found at http://forum.xda-developers.com/show....php?t=2496989. Or you can also try I9082LUBUBMK1 that I use.

How do I enable/disable Dual SIM?
Dual SIM support is enabled by default. If you only use 1 SIM and wants to disable Dual SIM support, you can use the following instruction:

Enable:
Disable:
(Instruction screenshots)

What are incremental/delta updates?
Delta updates allow updating from one version to another downloading only the difference rather than the full ROM, for those on limited bandwidth. They are named like "cm-12-20141206_from_20141202_delta-UNOFFICIAL-i9082.zip" which means that it can be used to update from 20141202 to 20141206 (simply flash it in recovery like any other update). Delta updates will not work if you have installed custom kernels or other system modifications, including editing build.prop. In those cases, downloading the full update is recommended (flashing a full update will not wipe your data).

If you want to restart from a clean state to use the delta. First format /system (not /data). Then flash full zip of any build. Then flash the gapps linked in this post. Do not flash any other zip or make any other modification to /system. After that, you should be able to use the delta. This will not erase your data, which is on /data.

How does OTA work?
You are able to check for and install update via Settings -> About -> CyanogenMod updates. Updates will be downloaded from the BasketBuild mirror. Delta updates will be used automatically if available (e.g. update to the immediate next build). Otherwise, the full update will be downloaded.

If after using the OTA, the version number remained the same, it means that the delta update was not flashed properly. See the "What are incremental/delta updates?" FAQ for more details. The error message is also available is /cache/recovery/last_log.

The Music app crashes every time I open it
There seems to be something causing corruption in the Media album art database. Clearing the data of the "Media Storage" application and rebooting should fix it.

To clear data, go to: Settings -> Apps -> All -> Media Storage -> Clear Data. Then reboot.

Login with Google does not work in some apps
Sometimes, on a fresh wipe, the phone language will be set to an invalid language. Changing it to a valid one from Settings should fix the issue.

Battery Statistics shows that Wi-Fi is always on even though I've turned it off.
If you are using "scanning always available" in Advanced Wi-Fi Settings, then Wi-Fi will always be on to scan for available network to aid location discovery.

How do I enable root?
Root is now disabled by default in CM. To enable root, first enable developer options. Then enable it in Settings -> Developer Options -> Root access.

I'm having battery issues
Read http://forum.xda-developers.com/gala...5/post57836573

Can you include Feature X into your ROM?
No. This ROM will have CyanogenMod's feature set.

Can you include S-Note/S-Planner/MultiWindow/Insert Samsung App Here?
No. This is an AOSP ROM and cannot have TouchWiz applications.

Can you include call recording?
No. CyanogenMod does not include call recording to avoid potential legal issues. In addition, unless a stock ROM with call recording is found, it is highly likely that it is not supported by our hardware.

Can you add Feature X to the stock ROM?
No. I don't work on stock ROMs.

What kernel does this ROM use?
A slightly modified version of the stock kernel, the source code is linked above.

I've heard that Broadcom doesn't release source, how can you make this ROM?
Contrary to the popular belief, userspace driver source code is not always required to make an AOSP-based ROM as long as the proprietary binaries shipped with the device does not modify the API too heavily (or is from a very different version of Android). Instead of modifying the source code of the drivers, the Android source code was adapted to be able to use the proprietary binaries.

Can I use your ROM as a base?
http://source.android.com/source/licenses.html

Most of Android/CyanogenMod is licensed under the Apache License with other small parts licensed under other open-source licenses. Which means that you may modify and redistribute without asking for permission as long as the proper credits is given and it is not misappropriated as being the official CyanogenMod. (In other words, you must say that it is based on pawitp's unofficial CyanogenMod, but is not related to CyanogenMod in any other way.)

Will you make this official CM?
Due to the amount of work and commitment involved, I am not planning to make an official CM port.

For example, I would have to re-format the compatibility patches in such a way that merging it into CM will not break other devices. When critical problems occur in an automatic nightly build, I would be expected to fix it in a day or two because users would continue to download those builds (as opposed to unofficial builds that I can test before releasing). I will also need to justify every modification made to the ROM, as it affects CM as a whole. For example, I may not be able to include the Samsung-style backlight behavior or WCDMA-only setting.

Can contacts be saved to phone/SIM?
No. It is not supported in AOSP-based ROMs.

Can I send files over Wi-Fi Direct?
Yes, but you must use third-party applications. The implementation provided on Samsung ROMs is not an open standard. AOSP/CM does not provide a native way to send files over Wi-Fi Direct.

Can I mirror your ROM?
You're free to, but I will not list it in this post.

Will feature X from a previous version of CM be implemented?
I don't know, probably will be, eventually. I don't really involve myself in the feature-set side of CM.

Reporting Bugs

You are allowed to report bugs only in this thread.

• Grab a logcat right after the problem has occurred. (Please include at least a few pages of the log, not just the last few lines, unless you know what you're doing.)


• If it is a random reboot, grab /proc/last_kmsg. (Do not bother getting a logcat unless you can get it just before the reboot. A logcat after a reboot is useless)


• If the problem disappears after running "setenforce 0" from a root shell, grab /data/misc/audit/audit.log

Remember to provide as much info as possible. The more info you provide, the more likely that the bug will be solved. Please also do not report known issues. Any bug not reported in the bug report format below may be ignored.

Thanks
- The CyanogenMod team for providing a great ROM. Without all the compatibility work which went into it, this ROM would've been much harder to make
- My real-life friend for letting me borrow his phone to work on this
- RampantRhino for donating a phone to help me continue with this project

XDA:DevDB Information
UNOFFICIAL CyanogenMod 12.1, ROM for the Samsung Galaxy Grand Duos i9082

Contributors
pawitp
ROM OS Version: 5.1.x Lollipop
ROM Kernel: Linux 3.0.x
Based On: CyanogenMod

Version Information
Status: Alpha

Created 2015-04-05
Last Updated 2015-04-05