[Samsung Galaxy A8 (2018) ROMs, Kernels, Recoveries] zolotoy22:
I did this:I created the build.prop file. copied to it

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# begin common build properties # autogenerated by build/make/tools/buildinfo_common.sh ro.system.build.date=Mon Oct 12 13:12:21 KST 2020 ro.system.build.date.utc=1602475941 ro.system.build.fingerprint=samsung/starltexx/starlte:10/QP1A.190711.020/G960FXXUCFTJ2:user/release-keys ro.system.build.id=QP1A.190711.020 ro.system.build.tags=release-keys ro.system.build.type=user ro.system.build.version.incremental=G960FXXUCFTJ2 ro.system.build.version.release=10 ro.system.build.version.sdk=29 ro.product.system.brand=samsung ro.product.system.manufacturer=samsung ro.product.system.model=SM-A530F ro.product.system.name=starltexx ro.product.system.device=starlte # end common build properties # begin build properties # autogenerated by buildinfo.sh ro.build.id=QP1A.190711.020 ro.build.display.id=FusionX_G960FXXUCFTJ2 ro.build.keys=test-keys ro.build.display_build_number=true ro.build.version.incremental=G960FXXUCFTJ2 ro.build.version.sdk=29 ro.build.version.preview_sdk=0 ro.build.version.preview_sdk_fingerprint=REL ro.build.version.codename=REL ro.build.version.all_codenames=REL ro.build.version.release=10 ro.build.version.security_patch=2020-10-01 ro.build.version.base_os= ro.build.version.security_index=1 ro.build.version.min_supported_target_sdk=23 ro.build.date=Mon Oct 12 13:12:21 KST 2020 ro.build.date.utc=1602475941 ro.build.type=user ro.build.user=dpi ro.build.host=SWDI3102 ro.build.tags=release-keys ro.build.flavor=starltexx-user # 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ro.product.cpu.abilist64=arm64-v8a ro.product.locale=en-GB ro.wifi.channels= # ro.build.product is obsolete; use ro.product.device # ro.product.name/ro.product.device should use PRODUCT_MODEL in case of jpn model ro.build.product=starlte # Do not try to parse description or thumbprint ro.build.description=starltexx-user 10 QP1A.190711.020 G960FXXUCFTJ2 release-keys # Samsung Specific Properties ro.build.PDA=G960FXXUCFTJ2 ro.build.official.release=true ro.build.2ndbrand=false ro.config.rm_preload_enabled=1 ro.build.changelist=19869059 ro.product_ship=true ro.user_trial=FALSE ro.hardware.chipname=exynos7885 ro.build.characteristics=phone # end build properties # # from device/samsung/starlte/system.prop # # # system.prop for universal7885 # ro.arch=exynos7885 ro.kernel.qemu=0 ro.kernel.qemu.gles=2 persist.demo.hdmirotationlock=false #Enable S.LSI USB settings dev.usbsetting.embedded=on #RILD debug level setting ro.debug_level=0x494d # read DS/SS property import /efs/factory.prop # Disable ConsumerIR config.disable_consumerir=true #Enable CSC for vendor image ro.vendor.cscsupported=1 #Cmc properties ro.cmc.device_type=pd ro.cmc.version=2.0 #Phone early start enable flag sys.config.phone_start_early=true # end of device/samsung/starlte/system.prop # # ADDITIONAL_BUILD_PROPERTIES # ro.treble.enabled=false ro.build.version.sem=2903 ro.build.version.sep=110500 ro.system.build.version.sehi=2905 ro.build.selinux=1 ro.config.knox=v30 ro.config.iccc_version=false ro.config.dmverity=false ro.config.tima=false ro.config.timaversion=false ro.config.timaversion_info=Knox3.4_S.R. ro.config.knox.ucm=false ro.config.kap=false ro.kernel.qemu=0 net.bt.name=Android ro.security.vaultkeeper.feature=0 ro.securestorage.knox=false wlan.wfd.hdcp=disable ro.securestorage.support=false ro.security.vaultkeeper.feature=0 persist.sys. usb. config=mtp, adb ro. adb. secure=0 ro. secure=0 ro. debuggable=1

and through root explorer copied this file to system with file replacement and the error when enabling disappeared

but it is better to copy the code from the post above to avoid errors