Stock Rom - Android Q&A, Help & Troubleshooting

Hello guys someone could help me carries a rom or is the stock rom for this phone model, because I have been a long time looking on the internet but never meeting, I tried porting roms for it but to no avail, then let the build.prop to you see the specifications of it.
# begin build properties
# autogenerated by buildinfo.sh
ro.build.id=JRO03C
ro.build.display.id=ALPS.JB.MP.V1.3_P4
ro.build.version.incremental=115
ro.custom.build.version=MEU_AN350_Brazil_V1.07
ro.tinno.build.version=S7503_PP_F2F3F5F8_B1B5_BR_BST_19_16_flasher_user
ro.build.version.sdk=16
ro.build.version.codename=REL
ro.build.version.release=4.1.1
ro.build.date=Fri May 31 18:53:54 CST 2013
ro.build.date.utc=1369997634
ro.build.type=user
ro.build.user=android
ro.build.host=HTSVR7
ro.build.tags=test-keys
ro.product.model=s7503
ro.product.brand=BRIGHTSTAR
ro.product.name=s7503
ro.product.device=s7503
ro.product.board=s7503
ro.product.cpu.abi=armeabi-v7a
ro.product.cpu.abi2=armeabi
ro.product.manufacturer=Enspert
ro.product.locale.language=pt
ro.product.locale.region=BR
ro.wifi.channels=
ro.board.platform=
# ro.build.product is obsolete; use ro.product.device
ro.build.product=s7503
# Do not try to parse ro.build.description or .fingerprint
ro.build.description=s7503-user 4.1.1 JRO03C 115 test-keys
ro.build.fingerprint=BRIGHTSTAR/s7503/s7503:4.1.1/JRO03C/:user/test-keys
ro.build.flavor=
ro.build.characteristics=default
# end build properties
# begin mediatek build properties
ro.mediatek.version.release=ALPS.JB.MP.V1.3_P4
ro.mediatek.platform=MT6575
ro.mediatek.chip_ver=S01
ro.mediatek.version.branch=ALPS.JB.MP
# end mediatek build properties
#
# system.prop for generic sdk
#
rild.libpath=/system/lib/mtk-ril.so
rild.libargs=-d /dev/ttyC0
# MTK, Infinity, 20090720 {
wifi.interface=wlan0
# MTK, Infinity, 20090720 }
# MTK, mtk03034, 20101210 {
ro.mediatek.wlan.wsc=1
# MTK, mtk03034 20101210}
# MTK, mtk03034, 20110318 {
ro.mediatek.wlan.p2p=1
# MTK, mtk03034 20110318}
# MTK, mtk03034, 20101213 {
mediatek.wlan.ctia=0
# MTK, mtk03034 20101213}
# MTK, TeChien {
ro.media.enc.hprof.file.format=3gp
ro.media.enc.hprof.codec.vid=m4v
ro.media.enc.hprof.vid.width=720
ro.media.enc.hprof.vid.height=480
ro.media.enc.hprof.vid.fps=30
ro.media.enc.hprof.codec.aud=amrnb
ro.media.enc.hprof.aud.bps=12200
ro.media.enc.hprof.aud.ch=1
ro.media.enc.hprof.aud.hz=8000
ro.media.enc.mprof.file.format=3gp
ro.media.enc.mprof.codec.vid=m4v
ro.media.enc.mprof.vid.width=352
ro.media.enc.mprof.vid.height=288
ro.media.enc.mprof.vid.fps=30
ro.media.enc.mprof.vid.bps=990000
ro.media.enc.mprof.codec.aud=amrnb
ro.media.enc.mprof.aud.bps=12200
ro.media.enc.mprof.aud.ch=1
ro.media.enc.mprof.aud.hz=8000
ro.media.enc.lprof.file.format=3gp
ro.media.enc.lprof.codec.vid=h263
ro.media.enc.lprof.vid.width=176
ro.media.enc.lprof.vid.height=144
ro.media.enc.lprof.vid.fps=30
ro.media.enc.lprof.vid.bps=384000
ro.media.enc.lprof.codec.aud=amrnb
ro.media.enc.lprof.aud.bps=12200
ro.media.enc.lprof.aud.ch=1
ro.media.enc.lprof.aud.hz=8000
# MTK, TeChien }
#
wifi.tethering.interface=ap0
#
ro.opengles.version=131072
wifi.direct.interface=p2p0
dalvik.vm.heapgrowthlimit=64m
dalvik.vm.heapsize=128m
# Encrypt phone function
ro.crypto.tmpfs_options=mode=0771,uid=1000,gid=1000
ro.crypto.fs_type=ext4
ro.crypto.fs_real_blkdev=/[email protected]
ro.crypto.fs_mnt_point=/data
ro.crypto.fs_options=noauto_da_alloc
ro.crypto.fs_flags=0x00000406
ro.com.google.clientidbase=android-enspert
# audio
ro.camera.sound.forced=0
ro.audio.silent=0
# USB Config Type
ro.sys.usb.storage.type=mtp,mass_storage
# USB MTP WHQL
ro.sys.usb.mtp.whql.enable=0
# Power off opt in IPO
sys.ipo.pwrdncap=2
ro.sys.usb.storage.type=mtp,mass_storage
# USB BICR function
ro.sys.usb.bicr=yes
#bt name.
net.tinno.bt.name = MEU AN350
#
# ADDITIONAL_BUILD_PROPERTIES
#
gps.solution.combo.chip=1
fmradio.driver.chip=3
ro.sf.hwrotation=0
ril.current.share_modem=2
launcherplus.allappsgrid=2d
launcher2.allappsgrid=3d_20
curlockscreen=2
ro.mediatek.gemini_support=true
persist.radio.fd.counter=20
persist.radio.fd.off.counter=20
drm.service.enabled=true
fmradio.driver.enable=1
dalvik.vm.mtk-stack-trace-file=/data/anr/mtk_traces.txt
mediatek.wlan.chip=MT6628
mediatek.wlan.module.postfix=_mt6628
ro.operator.optr=CUST
persist.sys.timezone=America/Sao_Paulo
ro.setupwizard.mode=OPTIONAL
ro.com.google.gmsversion=4.1_r5
ro.config.ringtone=MEUBRASIL.ogg
ro.config.ringtone_sim2=MEUCLASSICgg
ro.config.notification_sound=NOTIFICACAO_2.ogg
ro.config.alarm_alert=NOTIFICACAO_2.ogg
net.bt.name=Android
dalvik.vm.stack-trace-file=/data/anr/traces.txt
## GPU Tuned by Android BAM Tweaker ##
debug.composition.type=c2d
debug.performance.tuning=1
persist.sys.composition.type=c2d
## Max events per second increased by Android BAM Tweaker ##
windowsmgr.max_events_per_sec=170
## Touch tuned by Android BAM Tweaker ##
touch.presure.scale=0.001
## Scrolling speed tweak enabled by Android BAM Tweaker ##
ro.max.fling_velocity=12000
ro.min.fling_velocity=8000
## Wifi scan interval Increased by Android BAM Tweaker ##
wifi.supplicant_scan_interval=180
## Photo and Video recording quality Increased by Android BAM Tweaker ##
ro.media.dec.jpeg.memcap=8000000
ro.media.enc.hprof.vid.bps=8000000