[Guide] Fix All Bugs When Porting Custom ROM

This guide is to fix all the problems that you may face in your device after porting a new ROM. Using this guide you will able to fix bluetooth, camera, sdcard, radio, No Signal and many more issues in any Custom ROM for MT65xx device. This is universal guide and will work on all MT65xx devices.

Replace From Stock To Port :

To fix Radio and No Signal :
- \system\etc\firmware\mt6620_patch_e3_hdr.bin
- \system\etc\firmware\mt6620_patch_e6_hdr.bin
- \system\etc\firmware\WMT.CFG
- \system\lib\modules\mtk_fm_drv.ko
- \system\lib\libfmcust.so

To fix Bluetooth :
- \system\lib\libbluetooth_mtk.so
- \system\lib\libbluetoothem_mtk.so

To fix Wifi :
- \system\lib\modules\mtk_stp_wmt.ko

- \system\lib\modules\mtk_wmt_wifi.ko

To fix Storage :
For 4.2.2
- \system\etc\vold.fstab

- \system\etc\vold.fstab.nand
For 4.4.x and 5.1.1
-  /system/bin/vold 
- /system/bin/pq
- decompile framework-res.apk of both stock and port and replace storage_list.xml and recompile

To Fix Camera :
- \system\lib\hw\camera.default.so
- \system\lib\libcamera_client.so
- \system\lib\libcameracustom.so
- \system\lib\libcameraprofile.so
- \system\lib\libcameraservice.so
- \system\lib\libmhal.so
- \system\lib\libmhalcontent.so
- \system\lib\libmhaldrv.so
- \system\lib\libmhalmdp.so
- \system\lib\libmhalpipe.so
- \system\lib\libmhalscenario.so
- \system\lib\libmhalutility.so
- \system\etc\permission\android.hardware.camera.front.xml
- \system\etc\permission\android.hardware.camera.xml 


To Fix Bootloop :
- libandroid_runtime.so
- libandroid_servers.so
- libmedia_jni.so
- Repack boot.image

Fix Sensors :
- /system/bin/akmd*
- /system/lib/libsensors- so
- /system/lib/libms3c_yamaha- so
- /system/etc/firmware (folder)
- /system/bin/servicemanager

To Fix GPS :
- /system/xbin/ibmnlp 
- /system/etc/gps.conf

Fix Touchscreen :
- /system/usr

- /system/usr\keylayout\Generic.kl ->fix HomeKey 

Fix Sound/Audio :
First Replace :
- \system\lib\libaudio.primary.default.so
If it doesn't work then replace all :
- \system\lib\libaudio* .so


So, this is it. I hope you were able to fix issues and bugs in your Custom ROM for MTK. If you have any more bug fixes then please comment them below.

Credits :
- Ajit Guraya
- jawaad_s
- Scrack