[Sony Xperia M] ace312:
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ACE ROM is a free, community built, aftermarket firmware distribution of Android 4.4 (KitKat), which is designed to increase performance and reliability over stock Android for your device. It has been based over the famous rom Cr-Droid. This ROM will later on have its own UI, and stuff. For now, it is in a very initial stage.

#include
/*
* Your warranty is now void.
*
* I am not responsible for bricked devices, dead SD cards,
* thermonuclear war, or you getting fired because the alarm app failed. Please
* do some research if you have any concerns about features included in this ROM
* before flashing it! YOU are choosing to make these modifications, and if
* you point the finger at me for messing up your device, I will laugh at you.
*/

Halo

Hover

Heads Up

Ability to choose from floating window or normal window on halo notifications click

Incoming call in background

Navigation bar dimensions;

Enable or disable navigation bar

Low battery warning options

Lockscreen PIN keypad shuffler

Notification drawer custom background and transparency

Notifications row transparency

Custom clear all recents button (place it in any corner of the screen)

RAM bar

Option to hide app's status bar notification icons

Status bar clock and date customization

Screen recorder

Wakelock blocker

Media Scanner behaviour on boot

Notification reminder

Notification reminder flip interval

SlimRoms recent panel

Slim recent with option to show in left side and switch sizes (100, 85 and 70%)

Slim recent add favourite mode (click on app icon in recent panel to choose as favourite)

Custom navbar recent long press (none, last app, screenshot, kill app, notifications panel, QS panel, power menu)

Long press back to kill configurable timeout

Lockscreen notifications

Custom navbar recent long press (none, last app, screenshot, kill app, notifications panel, QS panel, power menu)

Long press back to kill configurable timeout

Lockscreen notifications

QS extended options (tiles per row - 3, 4 or 5 -- custom background color, custom text color, custom background pressed color, transparency)

Gesture lockscreen

Pause, resume or stop downloads from notification area

Launch floating window from notification (long click)

Launch floating window from recents panel (long click)

Option to enable/disable hepatic feedback on tiles pressing

Working :

Everything

Bugs :

You tell

Note

It's entirely possible that features not used by me (nor the people I've asked to test) are broken, but overall the device should be usable. You have been warned.

No ETAs.

Special Thanks to :

CrDroid < All thanks to this rom

CM Team

Slim Roms Team

ParanoidAndroid Team

And Many More...

From ACEROM get repo : http://get.acerom.us.to/nicki/

From MediaFire Mirror : https://www.mediafire.com/folder/6e1f88z4f9gs9/nicki​

Install instructions: (For 1st time)

boot into fastboot

flash boot.img from zip

boot into cwm recovery

Wipe data and cache

Flash the ACE and gapps zip

Reboot

Upgrading from earlier version of ACE :

Boot into Recovery

Flash CM11 zip

Reboot

ROM source : https://github.com/ACERom

Google + community : https://plus.google.com/communities/109644021927696556906