[Huawei Mate 20 X ROMs, Kernels, Recoveries, & Othe] freeza:
Thanks to xda member @fatouraee the EVR-AL00 firmware has been posted here. I've taken the time to download and dissect it and found a few interesting tidbits.

For starters it appears to be a engineering or internal build

build.prop lists it as an August security patch, so it is old.

# begin build properties
# autogenerated by buildinfo.sh
ro.build.id=PPR1.180610.001
ro.build.version.incremental=eng.root.20181019.195045
ro.build.version.sdk=28
ro.build.version.preview_sdk=0
ro.build.version.codename=REL
ro.build.version.all_codenames=REL
ro.build.version.release=9
ro.build.version.base_os=
config.disable_consumerir=true
ro.build.version.security_patch=2018-08-05
ro.build.version.min_supported_target_sdk=17
ro.build.date=Fri Oct 19 19:50:42 CST 2018
ro.build.date.utc=1539949842
ro.build.type=eng
ro.build.user=root
ro.build.host=sh0514826b41539948706875-7099393-jgmgb
ro.build.tags=test-keys
ro.build.system_root_image=true
# 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=unknown
ro.product.locale=en-US
ro.wifi.channels=
# Do not try to parse description, fingerprint, or thumbprint
ro.build.description=generic_a15-eng 9 PPR1.180610.001 eng.root.20181019.195045 test-keys
ro.build.fingerprint=Huawei/generic_a15/generic_a15:9/PPR1.180610.001/root10191950:eng/test-keys
ro.build.characteristics=default
# end build properties
#
# from device/emui/generic_a15/system.prop
#
persist.sys.cpuset.enable=1
persist.sys.cpuset.subswitch=16
persist.sys.iaware.cpuenable=true
persist.sys.fast_h_duration=2000
persist.sys.fast_h_max=50
persist.sys.max_rdh_delay=0
ro.config.enable_rcc=true
ro.config.hw_sensorhub=true
system_init.hwextdeviceservice=1
bastet.service.enable=true
dalvik.vm.boot-dex2oat-threads=4

#
# ADDITIONAL_BUILD_PROPERTIES
#
ro.control_privapp_permissions=log
ro.opa.eligible_device=true
ro.setupwizard.mode=OPTIONAL
ro.com.google.gmsversion=9_201806
ro.bionic.ld.warning=1
ro.art.hiddenapi.warning=1
ro.treble.enabled=true
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.android.checkjni=1
dalvik.vm.lockprof.threshold=0
dalvik.vm.image-dex2oat-filter=verify-at-runtime
net.bt.name=Android
dalvik.vm.stack-trace-dir=/data/anr
ro.expect.recovery_id=0xf227db076aec861e23fda4c530f3156b69ef8804000000000000000000000000

ro.build.display.id=System-FAC 9.0.0.062(00IE)

ro.comp.sys_support_vndk=

But, here's where things get interesting!

It appears to be rooted already. Of course, with no up to date software available, you will more than likely be stuck on this build until shipping/retail firmware becomes available. Someone should take one for the team and flash it. :)

Join our developer telegram group here for help flashing and testing out theories so that we may soon develop a method and guide to post on XDA regarding root and/or rebrand.