[Sprint Samsung Galaxy S6] abbn78:
After flashing the ROM try to replace this file "build.prop" in the root directory /system

with root explorer (this file is the original file of the PI3 ROM).

Because this file is modified to support GSM networks (the original is for CDMA networks)

Original file :

# begin build properties
# autogenerated by buildinfo.sh
ro.build.id=MMB29K
ro.build.display.id=MMB29K.G920PVPS4CPI3
ro.build.version.incremental=G920PVPS4CPI3
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/zerofltespr/zerofltespr:6.0.1/MMB29K/G920PVPU3CPG3:user/release-keys
ro.build.date=Tue Sep 20 09:53:14 KST 2016
ro.build.date.utc=1474332794
ro.build.type=user
ro.build.user=dpi
ro.build.host=SWDD6321
ro.build.tags=release-keys
ro.build.flavor=zerofltespr-user
ro.product.model=SM-G920P
ro.product.brand=samsung
ro.product.name=zerofltespr
ro.product.device=zerofltespr
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-US
ro.wifi.channels=
ro.board.platform=exynos5
# ro.build.product is obsolete; use ro.product.device
ro.build.product=zerofltespr
# Do not try to parse description, fingerprint, or thumbprint
ro.build.description=zerofltespr-user 6.0.1 MMB29K G920PVPS4CPI3 release-keys
ro.build.fingerprint=samsung/zerofltespr/zerofltespr:6.0.1/MMB29K/G920PVPS4CPI3:user/release-keys
ro.build.characteristics=chameleon
# Samsung Specific Properties
ro.build.PDA=G920PVPS4CPI3
ro.build.hidden_ver=G920PVPS4CPI3
ro.config.rm_preload_enabled=0
ro.build.changelist=8847946
ro.product_ship=true
ro.build.official.release=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/zerofltespr/system.prop
#
#
# system.prop for universal7420
#

#
# Integrate the Kineto VOWIFI changes
#rild.libpath=/system/lib64/libsec-ril.so
rild.libpath=/system/lib64/librilswitch.so
rilswitch.vendorlibpath=/system/lib64/libsec-ril.so
rilswitch.cfilibpath=/system/lib64/libcfiril.so
# End of kineto change
#
rild.libargs=-d /dev/smd0

ro.sf.lcd_density=640

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

ro.sf.lcd_density=640

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

# Enable time services daemon
persist.timed.enable=true

# Keep SIM state on LPM mode
persist.radio.apm_sim_not_pwdn=1

# Don't wait the card state for RADIO POWER request
persist.radio.no_wait_for_card=1

# For sys info indication
persist.radio.add_power_save=1

# Snapshot setting
persist.radio.snapshot_enabled=1
persist.radio.snapshot_timer=22

# Use CP SE13 Table
persist.radio.use_se_table_only=1

# Default ECCList
ro.ril.ecclist=911,#911,*911

# QMI mux enabled for Fusion 4.0 (For APQ8084 model, MDM9x35)
persist.rmnet.mux=enabled

# Use CDMALTE Phone (For 4G model)
telephony.lteOnCdmaDevice=1

# Support Global Mode (For global mode model)
ro.config.multimode_cdma=1

# Data modules (For evolution RIL model)
ro.use_data_netmgrd=false
persist.data.netmgrd.qos.enable=false

# Use data service state for signal display (Except USC CS model)
ro.config.combined_signal=true

# Default Network Mode (For 4G / Global model)
ro.telephony.default_network=10

# Chameleon Default Operator (SPR with Chameleon)
ro.cdma.default_numeric=310000
ro.cdma.default_alpha=Chameleon

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

#
# 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.ril.ecclist=911,#911,*911
ril.subscription.types=NV,RUIM
ro.com.android.dataroaming=true
ro.telephony.default_network=10
ro.cdma.default_numeric=310000
ro.cdma.default_alpha=Chameleon
ro.use_data_netmgrd=false
persist.radio.sib16_support=0
dalvik.vm.image-dex2oat-filter=speed
dalvik.vm.dex2oat-filter=speed
ro.config.notification_sound=Skyline.ogg
ro.config.vc_call_vol_steps=7
ro.config.ringtone=Over_the_Horizon.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.frp.pst=/dev/block/persistent
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.com.google.clientidbase.gmm=android-samsung
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
persist.gps.qc_nlp_in_use=1
persist.loc.nlp_name=com.qualcomm.location
ro.gps.agps_provider=1
ro.build.version.sdl=2301
ro.itson.path=/carrier/itson/
ro.expect.recovery_id=0x0a6245af52fb585c8dd00943e4f8d2e1c3dfdb1e000000000000000000000000

Modified file (to support GSM networks) :

# begin build properties
ro.build.id=MMB29K
ro.build.display.id=MMB29K.G920FXXS4CPI3
ro.build.version.incremental=G920FXXS4CPI3
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/G920FXXU3CPG3:user/release-keys
ro.build.date=Tue Sep 20 09:56:53 KST 2016
ro.build.date.utc=1474333013
ro.build.type=user
ro.build.user=dpi
ro.build.host=SWHC3716
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=zerofltexx
ro.product.board=universal7420
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=zeroflte
ro.build.description=zerofltexx-user 6.0.1 MMB29K G920FXXS4CPI3 release-keys
ro.build.fingerprint=samsung/zerofltexx/zeroflte:6.0.1/MMB29K/G920FXXS4CPI3:user/release-keys
ro.build.characteristics=nosdcard
ro.build.PDA=G920FXXS4CPI3
ro.build.hidden_ver=G920FXXS4CPI3

ro.config.rm_preload_enabled=0
ro.build.changelist=8847946
ro.product_ship=true
ro.build.official.release=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/zerofte/system.prop
#
# system.prop for universal7420
#

#
# Integrate the Kineto VOWIFI changes
# rild.libpath=/system/lib64/libsec-ril.so
# rild.libpath=/system/lib64/librilswitch.so
# rilswitch.vendorlibpath=/system/lib64/libsec-ril.so
# rilswitch.cfilibpath=/system/lib64/libcfiril.so
# End of kineto change
#
rild.libargs=-d /dev/smd0
ro.sf.lcd_density=640

# 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

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

# Enable time services daemon
# persist.timed.enable=true

[COLOR="Blue"]# General GSM Settings *********************
ro.telephony.default_network=9[/COLOR]
# ro.ril.def.preferred.network=9
[COLOR="Blue"]telephony.lteOnCdmaDevice=0
telephony.lteOnGsmDevice=1
ro.config.multimode_cdma=0[/COLOR]
persist.ril.modem.mode=2
persist.radio.vzw.cdma.mdn=deleted
ro.telephony.gsm-routes-us-smsc=0
persist.radio.ap.phonetype=1
persist.radio.lte.mm.disable=1
persist.ril.features=0x102
ro.HorizontalBUA=false
ro.HorizontalVVM=false
ro.telephony.ril.v3=signalstrength,skipbrokendatac all,writeaidonly
ro.telephony.ril.config=writeaidonly,signalstrength
telephony.rilV7NeedCDMALTEPhone=false
ro.cdma.subscribe_on_ruim_ready=false
persist.ril.mux.noofchannels=10
ro.cdma.nbpcd=0
ro.cdma.subscription=0
ro.com.android.dataroaming=false
ro.radio.networkmode=enable
ro.telephony.get_imsi_from_sim=true
persist.radio.apm_sim_not_pwdn=1

# Don't wait the card state for RADIO POWER request
persist.radio.no_wait_for_card=1
ro.telephony.call_ring.delay=0

# For sys info indication
persist.radio.add_power_save=1

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

#
# ADDITIONAL_BUILD_PROPERTIES
#
fw.max_users=3
fw.show_multiuserui=1
fw.show_hidden_users=1
fw.power_user_switcher=1

#Adb
persist.adb.notify=0
persist.service.adb.enable=1
persist.service.debuggable=1
persist.sys.usb.config=mtp,adb
#Enable ADB Debugging By Default & Disable USB Debugging

androidboot.selinux=0
boot.fps=20
shutdown.fps=20
mot.proximity.delay=15
persist.cne.feature=0
persist.mtp.notify=0
persist.usb.notify=0
pm.sleep_mode=1
ro.config.dmverity=false
ro.config.knox=0
ro.config.nocheckin=1
ro.config.tima=0
ro.kernel.android.checkjni=0
ro.kernel.checkjni=0
ro.lge.proximity.delay=15
ro.max.fling_velocity=12000
ro.min.fling_velocity=8000
ro.ril.disable.power.collapse=0
ro.ril.enable.amr.wideband=1
ro.ril.fast.dormancy.rule=0
ro.securestorage.knox=false
ro.securestorage.support=false
ro.security.mdpp.ux=Disabled
ro.sys.fw.use_trim_settings=true
security.knox_kap_mode=false
sys.config.samp_spcm_enable=false
sys.config.spcm_db_enable=false
sys.config.spcm_db_launcher=false
sys.config.spcm_preload_enable=false
sys.config.spcm_gcm_kill_enable=false
wlan.wfd.hdcp=disable
##
ro.astcenc.astcsupport=1
ro.mct.compressiontype=ETC1
ro.config.rkp=true
ro.config.kap_default_on=true
ro.config.kap=true
ro.ril.ecclist=112,911,#911,*911
ril.subscription.types=NV,RUIM
ro.use_data_netmgrd=false
persist.radio.sib16_support=0
dalvik.vm.image-dex2oat-filter=speed
dalvik.vm.dex2oat-filter=speed
ro.config.notification_sound=Skyline.ogg
# ro.config.vc_call_vol_steps=7
ro.config.ringtone=Over_the_Horizon.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
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.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
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.network_required=false
#ro.setupwizard.mode=OPTIONAL
ro.setupwizard.mode=DISABLED
# ro.com.google.gmsversion=6.0_r4
ro.com.google.clientidbase.gmm=android-samsung
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.kernel.qemu=0
net.bt.name=Android
dalvik.vm.stack-trace-file=/data/anr/traces.txt
persist.gps.qc_nlp_in_use=1
persist.loc.nlp_name=com.qualcomm.location
ro.gps.agps_provider=1
ro.build.version.sdl=2301
# ro.itson.path=/carrier/itson/
ro.expect.recovery_id=0xeea345a12651beb6c5b486f30968e49fa48eb5ef000000000000000000000000

dalvik.vm.checkjni=false
dalvik.vm.dexopt-flags=m=y
dalvik.vm.dexopt-flags=m=y,v=n,o=v
dalvik.vm.execution-mode=int:jit
dalvik.vm.verify-bytecode=false
lpa.decode=false
lpa.use-stagefright=false
media.stagefright.enable-aac=true
media.stagefright.enable-http=true
media.stagefright.enable-meta=true
media.stagefright.enable-player=true
media.stagefright.enable-qcp=true
media.stagefright.enable-record=true
media.stagefright.enable-scan=true
net.dns1=8.8.8.8
net.dns2=8.8.4.4
net.eth0.dns1=8.8.8.8
net.eth0.dns2=8.8.4.4
net.gprs.dns1=8.8.8.8
net.gprs.dns2=8.8.4.4
net.ppp0.dns1=8.8.8.8
net.ppp0.dns2=8.8.4.4
net.rmnet0.dns1=8.8.8.8
net.rmnet0.dns2=8.8.4.4
net.wlan0.dns1=8.8.8.8
net.wlan0.dns2=8.8.4.4
net.ipv4.ip_no_pmtu_disc=0
net.ipv4.route.flush=1
net.ipv4.tcp_ecn=0
net.ipv4.tcp_fack=1
net.ipv4.tcp_mem=187000
net.ipv4.tcp_moderate_rcvbuf=1
net.ipv4.tcp_no_metrics_save=1
net.ipv4.tcp_rfc1337=1
net.ipv4.tcp_rmem=4096
net.ipv4.tcp_sack=1
net.ipv4.tcp_timestamps=1
net.ipv4.tcp_window_scaling=1
net.ipv4.tcp_wmem=4096
net.tcp.buffersize.default=4096,87380,256960,4096,16384,256960
net.tcp.buffersize.edge=4096,87380,256960,4096,16384,256960
net.tcp.buffersize.evdo_b=6144,87380,1048576,6144,
net.tcp.buffersize.gprs=4096,87380,256960,4096,16384,256960
net.tcp.buffersize.hsdpa=6144,87380,1048576,6144,8
net.tcp.buffersize.hspa=6144,87380,524288,6144,163
net.tcp.buffersize.lte=524288,1048576,2097152,5242
net.tcp.buffersize.umts=4096,87380,256960,4096,16384,256960
net.tcp.buffersize.wifi=4096,87380,256960,4096,16384,256960
persist.sys.shutdown.mode=hibernate
persist.sys.ui.hw=1
power.saving.mode=1
power_supply.wakeup=enable
profiler.force_disable_err_rpt=1
ro.com.google.locationfeatures=1
ro.com.google.networklocation=1
ro.config.disable.hw_accel=false
ro.config.hw_fast_dormancy=1
ro.config.hw_menu_unlockscreen=false
ro.config.hw_power_saving=1
ro.product.gpu.driver=1
ro.ril.def.agps.mode=1
ro.ril.sensor.sleep.control=1
ro.secure=0
video.accelerate.hw=1
wifi.supplicant_scan_interval=180
windowsmgr.max_events_per_sec=100
ro.media.enc.jpeg.quality=95