IF you are planning to port a ROM for your android device, you will definitely encounter bugs along the ride. So here are some Bug fixes you can try to fix that buggy rom!
Use this on an MTK device ONLY!!!
Bootloop FIX
*libandroid_runtime.so
*libandroid_servers.so
*libmedia_jni.so
*Repack boot.image
RadioFM fix
\system\bin\fmradio
\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
Sensors not working? Replace the following
/system/bin/akmd*
/system/lib/libsensors.so
/system/lib/libms3c_yamaha.so
/system/etc/firmware (folder)
/system/bin/servicemanager
Bluetooth\Wifi not turning On\Off
\system\lib\module\mtk_stp_wmt
Bluetooth FIX
/system/bin/bd_prov
/system/bin/uim*
/system/bin/hcid
/system/bin/bluetooth*
/system/bin/hciattach
/system/bin/sdptool
/system/xbin/hciconfig
/system/bin/brcm_patchram_plus
/system/lib/libbluetooth_mtk.so
/system/lib/libbluetoothem_mtk.so
Wifi FIX
/system/bin/netcfg
/system/bin/dhcpcd
/system/bin/ifconfig
/system/bin/hostap
/system/bin/hostapd
/system/bin/hostapd_bin
/system/bin/pcscd
/system/bin/wlan*
/system/bin/wpa*
/system/bin/netd -> Fix wifi hotspot
/system/lib/libhardwarelegacy.so -> Fix wifi /system/lib/modules/mtk_stp_wmt.ko/system/lib/modules/mtk_wmt_wifi.ko
/system/etc/wifi (folder)
/system/etc/firmware (folder)
Camera FIX
/system/etc/media_profiles.xml
/system/lib/libcamera.so
/system/lib/liboemcamera.so
\system\lib\hw\camera.default.so
\system\lib\libcamera_client.so
\system\lib\libcameracustom.so\system\lib\libcamer aprofile.so
\system\lib\libcameraservice.so
\system\lib\libmhal.so\system\lib\libmhalcontent.s o
\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.fro nt.xml
\system\lib\libOmx*.so ->fix camcoder
SD card/Memory FIX
/system/bin/vold
\system\etc\vold.fstab -> edit file for swap internal and external
\system\etc\vold.fstab.nand
GPS FIX
\system\xbin\libmnlp
/system/etc/gps.conf
Touch Screen(Haptic)
/system/usr
/system/usr\keylayout\Generic.kl ->fix HomeKey
Sim1/2 Inactive/Not working
\system\etc\firmware\modem.img
\system\etc\permission (RIL)
/system/bin/stmd
/system/bin/rild*
/system/etc/rril
Audio/Sound FIX
\system\lib\libaudio* .so
Credits
XDA