All-in-one ROM porting guide [mediatek] [qualcomm] [Easy Guide]

All-in-one ROM porting guide
[mediatek] [qualcomm] [recovery]

[bug-fix] [cross-porting-mtk]
By kuberrocks96, (Kuber Sharma aka AlphaGeek),

Senior Member, on 13th February 2017, 05:09 PM


* 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.
*/

Update

* Updated Bug Fix Guide for MTK

* Added SNAPDRAGON Bug fix guide.

* Guide to port TWRP also updated.

* Improved the thread.

* Added more fixes.

* Qualcomm porting guide added.

Base Rom

Base Rom is referred to the Stock rom or the Default Rom of your device

or sometimes the rom from which you will take base files (libs, apns,
modem etc.).

Port Rom

Port Rom is the rom which you will port for your device.

Like if you are working a rom of another device having similar

specifications and porting it for your device then it is called Port Rom.

Kernel

The kernel is a computer program that is the core of a computer's
operating system, with complete control over everything in the system.

The central or most important part of something.

In easy words kernel acts as the middle man between the Software and
the Hardware.

When porting a rom, you should check the Kernel version of the

Port Rom and the Base Rom.

They both should be similar,

like you can port only from:

3.18.xx to 3.18.xx only

3.10.xx to 3.10.xx only

In this Guide, I’ll tell one of the easiest way to –

BOOT UP THE ROM.

So, let’s begin.

This guide will focus on MT6735/MT6753 porting.

Device used is Coolpad Note 3 Lite
CPU: MT6735

Author’s Note:

 When You Port a Rom, Change Files Wisely.

 Don’t Just Copy Paste.

 Porting a Rom Can Get Tough According to the Rom, Like

Porting an AOSP Build Can Be Easy but Porting a MiUI

Build is Considered One of the Toughest and Irritating

Thing.
 Respect The Efforts by The Previous Developers.

 Credits, When You Port a Rom Which Rom Was Made by

Someone, Ported by Someone or Bug Fixed by Someone –

So by Any Means If You Know the Source and the

Developer or Team Whose Build You Are Porting Pleaseso

Give Proper Credit.

Thanks.

NOW, FINALLY. LET'S TALK ABOUT THE PORTING GUIDE

WHICH YOU ALL ARE WAITING FOR.
What you guys need:

1. Base Rom

2. Port Rom

3. Notepad++

4.  Boot.img repack or unpack tool
5. Brain

BOOT.IMG

BOOT.IMG contains all the magic, it has the KERNEL

inside which is one of the main thing.
Porting from Same CPU & GPU:

MT6753 TO MT6753 or MT6735 TO MT6735

Use this method (95% times working)
System/lib & System/lib64

1.libaudiocomponentengine.so

2.libaudiocustparam.so

3.libnvram.so

4.libnvramagentclient.so

5.libnvram_platform.so

6.libnvram_sec.so

7.libcustom_nvram.so

System/etc

./Firmware folder

apnconfig

spnconfig

agps_profile_conf2

media_codecs.xml

BLACK SCREEN AFTER LOGO???
REPLACE THIS LIB:- libcam.paramsmgr

To Fix Camera (sometimes bootloop, so try one by one):

from System/lib & lib64 and HW folder, replace all libs

starting like this:-

libcamera.mt6735 (mt6735 is according to my CPU)

libcameracustom.lib etc

libcamalgo.lib

Unpack Boot.img of both Base & Port Rom

replace kernel

and init.mt6735.rc (not recommended always)

and Fstab.mt6735

Done, now zip em and flash.😱😱😱

My Youtube Channel

https://www.youtube.com/channel/UCPPGx12JXiM1VWVp7540c7Q