[Galaxy S6 Q&A, Help & Troubleshooting] Just Anton:
I was setting up google assist and did something stupid. tried to install GoodLock for Samsung (but galaxy apps wont allow me to install anything) then i realised i eddited the build.prop file.

i did backup before edditing it. i just copied original build.prop and pressed overwrite on the new file. now when i turn it on, it goes past initial samsung galaxy s6. then it should show logo and go on,

but it just stays black screen.

i know it loads as my phone goes to wifi and my web whatapp is working, just no screen/UI.

i have build prop below:

# begin build properties
# autogenerated by buildinfo.sh
ro.build.id=MMB29K
ro.build.display.id=MMB29K.G920FXXS4DPIJ
ro.build.version.incremental=G920FXXS4DPIJ
ro.build.version.sdk=23
ro.build.version.preview_sdk=0
ro.build.version.codename=REL
ro.build.version.all_codenames=REL
ro.build.version.release=6.0.1
ro.build.version.security_patch=2016-09-01
ro.build.version.base_os=samsung/zerofltexx/zeroflte:6.0.1/MMB29K/G920FXXU4DPGW:user/release-keys
ro.build.date=Mon Sep 19 12:13:26 KST 2016
ro.build.date.utc=1474254806
ro.build.type=user
ro.build.user=dpi
ro.build.host=SWHD7302
ro.build.tags=release-keys
ro.build.flavor=zerofltexx-user
ro.product.model=SM-G920F
ro.product.brand=samsung
ro.product.name=zerofltexx
ro.product.device=zeroflte
ro.product.board=universal7420
# ro.product.cpu.abi and ro.product.cpu.abi2 are obsolete,
# use ro.product.cpu.abilist instead.
ro.product.cpu.abi=arm64-v8a
ro.product.cpu.abilist=arm64-v8a,armeabi-v7a,armeabi
ro.product.cpu.abilist32=armeabi-v7a,armeabi
ro.product.cpu.abilist64=arm64-v8a
ro.product.manufacturer=samsung
ro.product.locale=en-GB
ro.wifi.channels=
ro.board.platform=exynos5
# ro.build.product is obsolete; use ro.product.device
ro.build.product=zeroflte
# Do not try to parse description, fingerprint, or thumbprint
ro.build.description=zerofltexx-user 6.0.1 MMB29K G920FXXS4DPIJ release-keys
ro.build.fingerprint=samsung/zerofltexx/zeroflte:6.0.1/MMB29K/G920FXXS4DPIJ:user/release-keys
ro.build.characteristics=nosdcard
# Samsung Specific Properties
ro.build.PDA=G920FXXS4DPIJ
ro.build.hidden_ver=G920FXXS4DPIJ
ro.config.rm_preload_enabled=0
ro.build.changelist=8821257
ro.product_ship=true
ro.chipname=exynos7420
# end build properties

#
# HWUI_BUILD_PROPERTIES
#
ro.hwui.texture_cache_size=88
ro.hwui.layer_cache_size=58
ro.hwui.path_cache_size=16
ro.hwui.texture_cache_flushrate=0.4
ro.hwui.shape_cache_size=4
ro.hwui.gradient_cache_size=2
ro.hwui.drop_shadow_cache_size=6
ro.hwui.r_buffer_cache_size=8
ro.hwui.text_small_cache_width=1024
ro.hwui.text_small_cache_height=1024
ro.hwui.text_large_cache_width=4096
ro.hwui.text_large_cache_height=2048
ro.hwui.fbo_cache_size=16
#
# from device/samsung/zeroflte/system.prop
#
#
# system.prop for universal7420
#
rild.libpath=/system/lib64/libsec-ril.so
rild.libargs=-d /dev/ttyS0

ro.sf.lcd_density=640

# RIL team modification
# netmgrd should be false in EVO-RIL model
ro.use_data_netmgrd=false

# RIL team modification
# qos will temporary false while supporting qos in EVO-RIL.
persist.data.netmgrd.qos.enable=false

ro.arch=exynos7420
persist.demo.hdmirotationlock=false
ro.zygote.disable_gl_preload=1

ro.sf.lcd_density=640

# GSM should be 0
telephony.lteOnCdmaDevice=0
# Start in gsm mode
ro.telephony.default_network=9

# Multimedia property for Smart View
media.enable-commonsource=true

# VQG - User Agent Header for Video-Streaming Client
net.streaming.rtsp.uaprof=http://wap.samsungmobile.com/uaprof/

# Multimedia property for Camcorder Recording
media.sfrec.adj_frames=2

# System property for storage_preload
persist.sys.storage_preload=1

# MST H/W SUPPORT
ro.mst.support=0

# SAMPOo
sys.config.samp_spcm_enable=true
sys.config.spcm_db_enable=true
sys.config.spcm_db_launcher=true
sys.config.spcm_preload_enable=true

#
# ADDITIONAL_BUILD_PROPERTIES
#
ro.astcenc.astcsupport=1
ro.mct.compressiontype=ETC1
ro.config.tima=1
ro.config.timaversion=3.0
ro.config.dmverity=true
ro.config.rkp=true
ro.config.kap_default_on=true
ro.config.kap=true
ro.telephony.default_network=9
persist.radio.sib16_support=0
dalvik.vm.image-dex2oat-filter=speed
dalvik.vm.dex2oat-filter=speed
ro.config.ringtone=Over_the_Horizon.ogg
ro.config.notification_sound=Skyline.ogg
ro.config.alarm_alert=Morning_Flower.ogg
ro.config.media_sound=Media_preview_Touch_the_light.ogg
ro.config.ringtone_2=Basic_Bell.ogg
ro.config.notification_sound_2=S_Charming_Bell.ogg
dalvik.vm.heapstartsize=8m
dalvik.vm.heapgrowthlimit=256m
dalvik.vm.heapsize=512m
dalvik.vm.heaptargetutilization=0.75
dalvik.vm.heapminfree=2m
dalvik.vm.heapmaxfree=8m
ro.opengles.version=196609
ro.sf.lcd_density=480
debug.hwc.force_gpu=0
debug.hwc.nodirtyregion=0
debug.hwc.winupdate=1
drm.service.enabled=true
ro.hdcp2.rx=tz
ro.secwvk=220
ro.securestorage.support=true
ro.build.scafe=capuccino
ro.build.scafe.size=short
ro.build.scafe.shot=single
ro.build.scafe.cream=white
ro.build.scafe.version=2016A
ro.sec.fle.encryption=false
ro.im.param.offset=7341648
ro.me.param.offset=7341728
ro.sn.param.offset=7341808
ro.pr.param.offset=7341888
ro.sku.param.offset=7341968
security.mdpp=None
ro.security.mdpp.ver=2.0
ro.security.mdpp.release=6
security.mdpp.result=None
ro.hardware.keystore=mdfpp
ro.security.vpnpp.ver=1.4
ro.security.vpnpp.release=6.1
ro.error.receiver.default=com.samsung.receiver.error
ro.config.dha_cached_min=6
ro.config.dha_cached_max=12
ro.config.dha_empty_min=8
ro.config.dha_lmk_scale=1.909
ro.config.64bit_lmk_enable=false
ro.config.dha_pwhitelist_enable=1
config.disable_atlas=true
sys.config.samp_oak_enable=true
sys.config.samp_oakoom_enable=true
sys.config.bigdata_enable=true
sys.config.bigdata_mem_enable=true
ro.security.mdpp.ux=Enabled
ro.security.reactive.active=2
keyguard.no_require_sim=true
ro.carrier=unknown
ro.com.google.clientidbase=android-samsung
ro.security.icd.flagmode=multi
ro.ril.hsxpa=1
ro.ril.gprsclass=10
ro.adb.qemud=1
ro.setupwizard.mode=OPTIONAL
ro.com.google.gmsversion=6.0_r4
ro.build.selinux=1
persist.sys.dalvik.vm.lib.2=libart.so
dalvik.vm.isa.arm64.variant=generic
dalvik.vm.isa.arm64.features=default
dalvik.vm.isa.arm.variant=cortex-a15
dalvik.vm.isa.arm.features=default
ro.config.knox=v30
ro.kernel.qemu=0
net.bt.name=Android
dalvik.vm.stack-trace-file=/data/anr/traces.txt
ro.build.version.sdl=2301
ro.expect.recovery_id=0x37d5376197487224c49289ddb7c6a33f67755dbb000000000000000000000000