DESCRIPTION

1. First you need to install the driver.
2. Then download and unpack to disk C: / modified Flash tool
3. Download Rom
4. ATTENTION! It is very important to extract both the program and the firmware on the C: / disk.
5. On the C:? Disk Go to the folder FlashToolMod-1 and in it we find and run the Flash_tool file, the program window opens before us.
6. Click on the Scatter-loading button.
7. And in the opened window we find the file MT6572_Android_scatter on the C drive in the folder with the firmware and click the open button.
8. We can see that the firmware was loaded in the window. After that, we press the Firmware-Upgrade button and wait for the green bars to continue to light. The Stop button on the indicator strip will be 0%.
9. And now only now we connect the OFF TELEPHONE TOGETHER FROM THE BATTERY INSERTED.
10. Nothing will happen – it's so necessary!
11. Pull and re-insert the battery for a second and the loading process will start immediately (the yellow bar should reach 100% and the Firmware Upgr … window will appear on the screen in the middle).
12. Unplug the cable from the phone pull out and insert the battery back, turn on the phone 

Build.prop

# begin build properties
# autogenerated by buildinfo.sh
ro.build.id=KOT49H
ro.build.display.id=Prime F400
ro.build.version.incremental=eng.scm.1467264479
ro.custom.build.version=1467264479
ro.build.version.sdk=19
ro.build.version.codename=REL
ro.build.version.release=4.4.2
ro.build.date=Thu Jun 30 13:30:30 CST 2016
ro.build.date.utc=1467264630
ro.build.type=user
ro.build.user=scm
ro.build.host=vanzo64
ro.build.tags=test-keys
ro.product.model=Prime B400
ro.product.brand=Ergo
ro.product.name=Prime_B400
ro.product.device=Prime_B400
ro.product.board=Z701
ro.product.cpu.abi=armeabi-v7a
ro.product.cpu.abi2=armeabi
ro.product.manufacturer=Ergo
ro.product.locale.language=ru
ro.product.locale.region=RU
ro.wifi.channels=
ro.board.platform=MT72_Z701
# ro.build.product is obsolete; use ro.product.device
ro.build.product=Z701
# Do not try to parse ro.build.description or .fingerprint
ro.build.description=Z701-user 4.4.2 KOT49H eng.scm.1467264479 test-keys
ro.build.fingerprint=alps/Z701/Z701:4.4.2/KOT49H/1467264479:user/test-keys
ro.build.flavor=mt72_z701_primef400_jpx_cc-ergo_kk_wcdma_mul
ro.build.characteristics=default
# end build properties

# begin mediatek build properties
ro.mediatek.version.release=ALPS.KK1.MP7.V1
ro.mediatek.platform=MT6572
ro.mediatek.chip_ver=S01
ro.mediatek.version.branch=KK1.MP7
ro.mediatek.version.sdk=2
# end mediatek build properties
#
# from out/target/product/vanzo72_cwet_kk/obj/CUSTGEN/config/system.prop
#
#
# 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}

#
wifi.tethering.interface=ap0
#

ro.opengles.version=131072

wifi.direct.interface=p2p0
dalvik.vm.heapgrowthlimit=96m
dalvik.vm.heapsize=128m

# 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

# USB Charge only function
ro.sys.usb.charging.only=yes

# audio
ro.camera.sound.forced=0
ro.audio.silent=0

ro.zygote.preload.enable=0

ro.kernel.zio=38,108,105,16

#
# ADDITIONAL_BUILD_PROPERTIES
#
persist.gemini.sim_num=2
ro.gemini.smart_sim_switch=false
ro.gemini.smart_3g_switch=1
ril.specific.sm_cause=1
bgw.current3gband=0
ril.external.md=0
ro.btstack=blueangel
ro.sf.hwrotation=0
ril.current.share_modem=2
curlockscreen=1
ro.mediatek.gemini_support=true
persist.radio.fd.counter=15
persist.radio.fd.off.counter=5
persist.radio.fd.r8.counter=15
persist.radio.fd.off.r8.counter=5
drm.service.enabled=true
fmradio.driver.enable=1
ril.first.md=1
ril.flightmode.poweroffMD=1
ril.telephony.mode=1
dalvik.vm.mtk-stack-trace-file=/data/anr/mtk_traces.txt
persist.mtk.anr.mechanism=1
mediatek.wlan.chip=mediatek.wlan.module.postfix=_
ril.radiooff.poweroffMD=0
ro.config.notification_sound=OnTheHunt.ogg
ro.config.alarm_alert=Alarm_Classic.ogg
ro.config.ringtone=Backroad.ogg
persist.mtk.wcn.combo.chipid=-1
ter.service.enable=0
mediatek.extmd.usbport=0
ro.lte.dc.support=0
ril.active.md=0
ro.init.call_vol=7
ro.init.ringtone_vol=15
ro.init.notification_vol=15
ro.init.fm_vol=15
persist.sys.timezone=Europe/Helsinki
persist.sys.dalvik.vm.lib=libdvm.so
net.bt.name=Android
dalvik.vm.stack-trace-file=/data/anr/traces.txt

# begin fota properties
ro.fota.platform=MTK6572_KK
ro.fota.type=phone
ro.fota.oem=vanzo6572_KK
ro.fota.device=Prime B400
ro.fota.version=Prime F400
# begin fota properties

※Please make a backup of your device before installing or updating ROM