[Meizu MX] gczobel:
All the partitions were mount.

I found that reformating the system partition to f2fs and again to ext4 fixed the issue. The ROM was installed successfully.

Now, I have another issue trying to install the gapps zip. I'm using the recommended 'gapps-base-arm64-7.1.2-20170730-1-signed.zip' (and checked the md5)

When try to install, I receive the below error:

script aborted: set_metadata_recursive: some changes failed
set_metadata_recursive: some changes failed
Updater process ended with ERROR: 7

Complete log

I:Set page: 'flash_done'
I:operation_end - status=1
I:Set page: 'clear_vars'
I:Set page: 'install'
I:Set page: 'flash_confirm'
I:Set page: 'flash_zip'
I:operation_start: 'Flashing'
Installing zip file '/external_sd/gapps-base-arm64-7.1.2-20170730-1-signed.zip'
Checking for MD5 file...
Skipping MD5 check: no MD5 file found
I:Update binary zip
I:Zip does not contain SELinux file_contexts file in its root.
I:Legacy property environment initialized.
***********************************************
Google Apps Base for Android 7.1.2 arm64
***********************************************
Mounting system.
about to run program [/sbin/busybox] with 3 args
run_program: execv failed: No such file or directory
run_program: child exited with status 1
about to run program [/sbin/mount] with 5 args
mount: '/system' not in /proc/mounts
run_program: child exited with status 1
Cleaning system.
about to run program [/sbin/mkdir] with 2 args
Installing files.
about to run program [/sbin/mkdir] with 2 args
about to run program [/sbin/mkdir] with 2 args
about to run program [/sbin/mkdir] with 2 args
about to run program [/sbin/mkdir] with 2 args
minzip: Extracted file "/tmp/config/priv-app/ConfigUpdater/ConfigUpdater.apk"
minzip: Extracted file "/tmp/dialer/etc/permissions/com.google.android.dialer.support.xml"
minzip: Extracted file "/tmp/dialer/framework/com.google.android.dialer.support.jar"
minzip: Extracted file "/tmp/face/addon.d/71-gapps-faceunlock.sh"
minzip: Extracted file "/tmp/face/app/FaceLock/FaceLock.apk"
minzip: Extracted file "/tmp/face/lib/libfilterpack_facedetect.so"
minzip: Extracted file "/tmp/face/lib64/libfacenet.so"
minzip: Extracted file "/tmp/face/lib64/libfilterpack_facedetect.so"
minzip: Extracted file "/tmp/face/vendor/lib/libfrsdk.so"
minzip: Extracted file "/tmp/face/vendor/lib64/libfrsdk.so"
minzip: Extracted file "/tmp/setup/priv-app/SetupWizard/SetupWizard.apk"
minzip: Extracted file "/tmp/install-core-0.sh"
minzip: Extracted file "/tmp/install-core-6.sh"
minzip: Extracted file "/tmp/install-core-8.sh"
minzip: Extracted file "/tmp/install-optional.sh"
minzip: Extracted file "/system/addon.d/70-gapps.sh"
minzip: Extracted file "/system/app/GoogleContactsSyncAdapter/GoogleContactsSyncAdapter.apk"
minzip: Extracted file "/system/app/GoogleExtShared/GoogleExtShared.apk"
minzip: Extracted file "/system/etc/default-permissions/default-permissions.xml"
minzip: Extracted file "/system/etc/g.prop"
minzip: Extracted file "/system/etc/permissions/com.google.android.maps.xml"
minzip: Extracted file "/system/etc/permissions/com.google.android.media.effects.xml"
minzip: Extracted file "/system/etc/permissions/com.google.widevine.software.drm.xml"
minzip: Extracted file "/system/etc/preferred-apps/google.xml"
minzip: Extracted file "/system/etc/sysconfig/google.xml"
minzip: Extracted file "/system/etc/sysconfig/google_build.xml"
minzip: Extracted file "/system/etc/sysconfig/google_vr_build.xml"
minzip: Extracted file "/system/etc/sysconfig/marlin_common.xml"
minzip: Extracted file "/system/etc/sysconfig/whitelist_com.android.omadm.service.xml"
minzip: Extracted file "/system/framework/com.google.android.maps.jar"
minzip: Extracted file "/system/framework/com.google.android.media.effects.jar"
minzip: Extracted file "/system/framework/com.google.widevine.software.drm.jar"
minzip: Extracted file "/system/lib64/libjni_latinimegoogle.so"
minzip: Extracted file "/system/priv-app/GmsCoreSetupPrebuilt/GmsCoreSetupPrebuilt.apk"
minzip: Extracted file "/system/priv-app/GoogleBackupTransport/GoogleBackupTransport.apk"
minzip: Extracted file "/system/priv-app/GoogleExtServices/GoogleExtServices.apk"
minzip: Extracted file "/system/priv-app/GoogleFeedback/GoogleFeedback.apk"
minzip: Extracted file "/system/priv-app/GoogleLoginService/GoogleLoginService.apk"
minzip: Extracted file "/system/priv-app/GoogleOneTimeInitializer/GoogleOneTimeInitializer.apk"
minzip: Extracted file "/system/priv-app/GooglePartnerSetup/GooglePartnerSetup.apk"
minzip: Extracted file "/system/priv-app/GoogleServicesFramework/GoogleServicesFramework.apk"
minzip: Extracted file "/system/priv-app/Phonesky/Phonesky.apk"
about to run program [/tmp/install-optional.sh] with 2 args
grep: /system/build.prop: No such file or directory
Phone detected.
minzip: Extracted file "/tmp/gms/priv-app/PrebuiltGmsCore/PrebuiltGmsCore.apk"
about to run program [/tmp/install-core-0.sh] with 2 args
grep: /system/build.prop: No such file or directory
Installing default.
minzip: Extracted file "/tmp/gms/priv-app/PrebuiltGmsCore/PrebuiltGmsCore.apk"
about to run program [/tmp/install-core-6.sh] with 2 args
grep: /system/build.prop: No such file or directory
minzip: Extracted file "/tmp/gms/priv-app/PrebuiltGmsCore/PrebuiltGmsCore.apk"
about to run program [/tmp/install-core-8.sh] with 2 args
grep: /system/build.prop: No such file or directory
Setting metadata.
ApplyParsedPerms: removexattr of /system/addon.d/70-gapps.sh to 0 failed: Operation not supported on transport endpoint
script aborted: set_metadata_recursive: some changes failed
set_metadata_recursive: some changes failed
Updater process ended with ERROR: 7
I:Legacy property environment disabled.
I:Install took 3 second(s).
Error installing zip file '/external_sd/gapps-base-arm64-7.1.2-20170730-1-signed.zip'
Updating partition details...
I:Data backup size is 0MB, free: 11887MB.
I:Unable to mount '/usbotg'
I:Actual block device: '', current file system: 'auto'
...done