Rom porting from mtk6797 to mtk 6755

Mission :

*To boot the rom first
What to need!!!!??
*boot.img and System.img or system folder
*Rest ..Delete all folders
Important:
1.If u have system.img extract it and keep it as system folder
2.B4 doing anything in system folder....Delete recovery-from-boot.p
Procedure:
System part:
*Replace from stock to port the below files
         
     
      1. Etc/ firmware,apn.conf and spn.conf and mddb
      2.Libs and Lib64 /egl and hw folders fully
   
        mtk drb,lib.pq,DEC.pipe,showlogo,ipod,stagefright all files     
               
      3.Build.prop/LCD,Consys,Rotation and replace Mt6797 to mt67xx
             ro.mtk.xxxx files from stock to port//....(all should be same)

Boot.img part:

*Replace stock to port......kernel,Fstab.mt67xx,init.mt67xx.rc, init.mt67xx.usb.rc,init.modem.rc,init.mal.rc,init.volte.rc
*(Add  init.recovery.mt67xx if present in stock boot.img)

Lets see Deep in ::::::::::

1.file_context: dont replace these lines

 MICROTRUST START
/dev/ut_keymaster u:object_r:ut_keymaster_device:s0
##nubia add for MICROTRUST END
#line 1 "device/zte/NX541J/goodix/products/sepolicy/file_contexts"
# goodix fingerprint
/dev/goodix_fp                 u:object_r:goodixfingerprintd_device:s0
/system/bin/goodixfingerprintd u:object_r:goodixfingerprintd_exec:s0
# goodix fingerprint end
#line 1 "device/zte/NX541J/microarray/products/sepolicy/file_contexts"
#microarray chr dev madev0
/dev/madev0 u:object_r:microarray_device:s0
#endf
IT MAY CAUSE SETTINGS FC

2.init.project.rc

Replace oly camera lines
#Camera
    chmod 0660 /dev/MAINAF
    chown system camera /dev/MAINAF

    chmod 0660 /dev/MAINAF2
    chown system camera /dev/MAINAF2

    chmod 0660 /dev/SUBAF
    chown system camera /dev/SUBAF

3.init.project.rc

Check for header files...it should be same

4.init.rc

Check for header files...it should be same like below

import /init.environ.rc

import /init.usb.rc

import /init.${ro.hardware}.rc

import /init.${ro.zygote}.rc

import /init.trace.rc

import /init.miui.rc

import init.supersu.rc

5.Dont touch init.environ.rc and init.trace.rc.................it may cause bootloop for sure

Note:Today also i ask help from Syed sir...so this may work or may not work for u.....

Meta-Inf part:

*I use Syed sir tool for Auto writing scripts...

If booted successfully ....

Bug Fix:

*Camera 

then copy all files from stock to port....... bin,etc,lib/64 and donot replace anything

*Audio

Replace  stock to port (or) port to stock......... lib/64 audio.primary.mt67xx.so