[Galaxy Tab 4 Android Development] hennymcc:
This is a CyanogenMod 12.1 ROM for the Exynos3470 based Samsung Galaxy Tab 4 7.0 LTE (T235/T235Y).

DO NOT USE IT FOR T230(NU)/T231 OR YOU WILL BRICK YOUR DEVICE

Although T235 and T230(NU)/T231 (T230:WiFi / T231:3G) share the "Galaxy Tab 4 7.0" name they are not related in terms of hardware due to the different SoCs used (Samsung Exynos3470 vs. Marvell PXA1088).

Hence please do not ask for support or ROMs for the T230(NU)/T231.

Working features

Receiving and making calls

Hardware sensors (Acceleration)

Audio

Bluetooth

Wifi

HW accelerated GUI

MTP storage

GPS

USB-OTG (Mass-Storage, Keyboard, Mouse working, USB-Audio untested)

Camera (pictures+video: Back+Front)

Non-working features:

SELinux

Known issues:

See the Bug Report section of this thread

Before you start:

Backup your data, like call history, contacts, sms, WhatsApp messages, favourite app settings that are on internal and external sd (by using Titanium Backup or other apps available on PlayStore). At least all internal data will be lost in any case. If you have bad luck you might also loose data from your external sd card.

Download:

Odin3-v1.85

TWRP 2.8.7.0 recovery image [09/08/2015] (AndroidFileHost Mirror)

CM 12.1 ROM (AndroidFileHost Mirror)

Google Apps (contains Google Play, ...) for Android 5.1.1 from Jajb (Recommended) or the one that suits you best from Consolidated GApps.

Install recovery:

Reboot your device into Odin mode: turn off your device, then press Volume-Down + Home + Power button at the same time and release them.

Confirm the following warning message with the Volume-Up button.

Connect your device to your PC via USB

Make sure the device driver's are installed on your PC

Start Odin

In Odin select PDA and select the recovery image (recovery.tar.md5)

Check that only "Auto Reboot" and "F. Reset Time" is set

Click on "Start": the kernel image should be flashed now and the device should reboot afterwards. By flashing the recovery, your warranty will be void.

After the recovery flashing process was successful, power of your device. If not restart into Download mode and flash again or flash the stock rom.

Before you flash:

You need the latest TWRP recovery (see links above). Otherwise TWRP might not be able to flash the ROM.

Wipe the device to avoid problems with remaining files from the old installation (see instructions below). This also applies if you already installed an older version of CM 12.1.

Flash CyanogenMod:

Reboot into recovery mode (Press Volume-Up + Home + Power button)

If you come from a stock ROM, this is your opportunity to make a Backup of your phone(Backup, then select Boot, System, Data, then swipe to backup). Note that the recovery might fail to restore the backup when you want to go back to the stock ROM (for me it got stuck after a restore during boot. But the backup was made with a different version of TWRP, so it might work in general) - simply do not expect too much of it at the moment.

If you haven't copied the installation files yet, you can now copy the GApps and CyanogenMod zip to your internal sd or external sd (be careful not to put the files into the data directory of the internal sd card as this will be deleted in the next step). Be sure that MTP is enabled (inside Mounts, click on Enable MTP), then, from your pc, copy the files. If MTP does not work from recovery, try it directly from Android or remove the external sd card from the phone and put it into your PC.

Wipe Dalvik Cache, Cache, System and Data (inside Wipe -> Advanced Wipe). Do not report problems if you did not wipe those partitions as the problems are most probably related to this!

Install the CM 12.1 ROM zip-package

Install the GApps zip-package

Reboot the system and enjoy a Lollipop

How to root:

No SuperSu is needed as CyanogenMod already comes with integrated root support. Root access is disabled by default.

You normally do not need root access. If you want to activate root access for apps, do the following:

Open the Settings menu, select "About Phone"

Tap on the "Build number" entry seven times. You should be notified, that the developer settings are now active.

Open the Settings menu, select "Developer options". Enable root access by selecting "Apps" in the "Root-Access" setting.

In case you want to go back to the stock ROM:

lf you do not have the latest stock ROM you can download it from SamMobile

Reboot your phone into Odin mode

Open Odin on your PC and connect your smartphone with your PC via USB

If you have a zip-file unzip it so that you have a .tar.md5 file

In Odin click on the PDA button and select the .tar.md5 file. Then press "Start".

Normally the stock rom fails to boot as the data from CM12 is still on the data partition. So after flashing the stock rom, reboot into recovery mode (it looks a bit different now). First wipe the data partition, then wipe the cache.

Reboot

Changelog

09/08/2015:
*Update kernel to T235XXU1AOD1
*Synchronize with newest CM 12.1 sources (contains stagefright patches)
*Fixed black screen on minimal brightness
12/07/2015:
* Charging animation in standby-mode fixed
11/07/2015:
* Update to newest CyanogenMod sources (LMY48G)
* Left touchkey working now (configured as App-Switch button)
* Camera Preview working (saving a picture might still crash)
30/06/2015:
* Image sizes reduced to fix "unable to mount /system" problems
28/06/2015:
* Initial test-build

This section is for developers:

A README file with build instructions can be found here:

https://github.com/cm-3470/patcher_degaslte

Sources:

https://github.com/cm-3470/android_device_samsung_degaslte
https://github.com/cm-3470/android_vendor_samsung_degaslte
https://github.com/cm-3470/android_kernel_samsung_degaslte
https://github.com/cm-3470/android_device_samsung_smdk3470-common

Developers welcome

Help from other developers is always welcome. See the bug/feature section and this thread to see what is missing. Just give some short info (here in this thread or PM) that you want to work on some issue or feature so that work can be synchronized. Maybe there are also other devs that want to work with you on the same issue.

Knowledge in how the kernel works and good programming skills in C, C++ and Java would be nice but not necessary for all problems. At least you should be able to build the ROM and test your changes yourself but you do not need experience in porting ROMs.

XDA:DevDB Information

[T235][ROM][5.1.1][LMY48G] CyanogenMod 12.1 for T235(Y) [Alpha 09/08/2015], ROM for the Samsung Galaxy Tab 4

Contributors

hennymcc

Source Code: https://github.com/cm-3470

ROM OS Version: 5.1.x Lollipop

ROM Kernel: Linux 3.4.x

ROM Firmware Required: TWRP Recovery [version from 09/08/2015]

Based On: CyanogenMod

Version Information

Status: Alpha

Created 2015-06-29

Last Updated 2015-09-24