[LeEco Le1 Pro Questions & Answers] BetaHydri:
Even with a factory reset on my actual CUOCO92 V4.2 build I'm not able to update to 4.3 and then 4.4 via OTA-Updater.

After installation without errors regarding the TWRP install output my phone ist still on build 4.2. Maybe I have to delete all partitions and do a restore to the factory ROM via TWRP 3.0.2 restore.

Look at my last "last_ota_log". I tried also to install another ZIP here for example SuperSU Beta 2.74 this one also has problems:

.....

I:Set page: 'flash_zip'

I:operation_start: 'Flashing'

Installing zip file '/sdcard/SuperSU-v2.74-2-20160519174328.zip'

Checking for MD5 file...

Skipping MD5 check: no MD5 file found

I:Zip does not contain SELinux file_contexts file in its root.

I:Legacy property environment initialized.

*****************

SuperSU installer

*****************

- Mounting /system, /data and rootfs

mount: mounting /dev/block/mmcblk0p40 on /system failed: Device or resource busy

mount: mounting /dev/block/mmcblk0p47 on /data failed: Device or resource busy

2+0 records in

2+0 records out

2 bytes (2B) copied, 0.002538 seconds, 788B/s

3+0 records in

3+0 records out

3 bytes (3B) copied, 0.000582 seconds, 5.0KB/s

10+0 records in

10+0 records out

10 bytes (10B) copied, 0.000735 seconds, 13.3KB/s

0+0 records in

0+0 records out

0 bytes (0B) copied, 0.002195 seconds, 0B/s

mount: mounting /dev/block/mmcblk0p40 on /system failed: Device or resource busy

mount: mounting /dev/block/bootdevice/by-name/system on /system failed: Device or resource busy

/tmp/updater: line 804: can't create /system/toolbox: Read-only file system

chmod: /system/toolbox: No such file or directory

/tmp/updater: line 839: /system/toolbox: not found

- Extracting files

Archive: /sdcard/SuperSU-v2.74-2-20160519174328.zip

inflating: META-INF/MANIFEST.MF

inflating: META-INF/CERT.SF

inflating: META-INF/CERT.RSA

inflating: META-INF/com/google/android/update-binary

inflating: META-INF/com/google/android/updater-script

inflating: arm/chattr

inflating: arm/chattr.pie

inflating: arm/libsupol.so

inflating: arm/su

inflating: arm/sukernel

inflating: arm/supolicy

inflating: arm64/chromeos/futility

inflating: arm64/libsupol.so

inflating: arm64/su

inflating: arm64/sukernel

inflating: arm64/supolicy

inflating: armv7/chattr.pie

inflating: armv7/libsupol.so

inflating: armv7/su

inflating: armv7/sukernel

inflating: armv7/supolicy

inflating: common/000000deepsleep

inflating: common/99SuperSUDaemon

inflating: common/Superuser.apk

inflating: common/chromeos/kernel.bootloader

inflating: common/chromeos/kernel.config

inflating: common/chromeos/kernel.keyblock

inflating: common/chromeos/kernel_data_key.vbprivk

inflating: common/file_contexts_image

inflating: common/install-recovery.sh

inflating: common/launch_daemonsu.sh

inflating: mips/chattr.pie

inflating: mips/libsupol.so

inflating: mips/su

inflating: mips/sukernel

inflating: mips/supolicy

inflating: mips64/libsupol.so

inflating: mips64/su

inflating: mips64/sukernel

inflating: mips64/supolicy

inflating: x64/libsupol.so

inflating: x64/su

inflating: x64/sukernel

inflating: x64/supolicy

inflating: x86/chattr

inflating: x86/chattr.pie

inflating: x86/libsupol.so

inflating: x86/su

inflating: x86/su.pie

inflating: x86/sukernel

inflating: x86/supolicy

supolicy v2.74 (ndk:arm64-v8a) - Copyright (C) 2014-2016 - Chainfire

Patching policy ...

-permissive:adbd_socket=ok

-permissive:functionfs=ok

-permissive:hci_attach_exec=ok

-permissive:system_server=ok

-permissive:nfc=ok

-permissive:rild_debug_socket=ok

-permissive:file_type=ok

-permissive:exec_type=ok

-permissive:property_type=ok

-permissive:surfaceflinger_service=ok

-permissive:binderservicedomain=ok

-permissive:mdns_socket=ok

-permissive:node_type=ok

-permissive:platform_app=ok

-permissive:ram_device=ok

-permissive:port_type=ok

-permissive:rootfs=ok

-permissive:tmpfs=ok

-permissive:usbfs=ok

-permissive:bootanim_exec=ok

-permissive:gpsd_tmpfs=ok

-permissive:installd_exec=ok

-permissive:su_tmpfs=ok

-permissive:untrusted_app_tmpfs=ok

-permissive:cpuctl_device=ok

-permissive:cgroup=ok

-permissive:drmserver_socket=ok

-permissive:ppp_device=ok

-permissive:wpa_socket=ok

-permissive:proc_net=ok

-permissive:vdc=ok

-permissive:clatd=ok

-permissive:netd=ok

-permissive:sdcardd=ok

-permissive:zygote=ok

-permissive:debuggerd=ok

-permissive:input_device=ok

-permissive:mediaserver_tmpfs=ok

-permissive:sysfs_ksm=ok

-permissive:ueventd_tmpfs=ok

-permissive:download_file=ok

-permissive:mtp=ok

-permissive:backup_data_file=ok

-permissive:servicemanager_tmpfs=ok

-permissive:su_exec=ok

-permissive:ppp_exec=ok

-permissive:tee_exec=ok

-permissive:vdc_exec=ok

-permissive:wpa_exec=ok

-permissive:dumpstate_tmpfs=ok

-permissive:mqueue=ok

-permissive:mtp_exec=ok

-permissive:system_ndebug_socket=ok

-permissive:tee=ok

-permissive:adb_data_file=ok

-permissive:anr_data_file=ok

-permissive:app_data_file=ok

-permissive:dhcp_data_file=ok

-permissive:logdr_socket=ok

-permissive:logdw_socket=ok

-permissive:net_data_file=ok

-permissive:shell_data_file=ok

-permissive:vpn_data_file=ok

-permissive:adb_keys_file=ok

-permissive:dalvikcache_data_file=ok

-permissive:keystore_tmpfs=ok

-permissive:kernel=ok

-permissive:dhcp_tmpfs=ok

-permissive:platform_app_data_file=ok

-permissive:dhcp=ok

-permissive:mediaserver_service=ok

-permissive:dnsmasq=ok

-permissive:drmserver=ok

-permissive:drmserver_tmpfs=ok

-permissive:keystore=ok

-permissive:property_data_file=ok

-permissive:vold_exec=ok

-permissive:adbd=ok

-permissive:dumpstate=ok

-permissive:racoon_exec=ok

-permissive:rild_exec=ok

-permissive:unlabeled=ok

-permissive:bluetooth=ok

-permissive:uncrypt_tmpfs=ok

-permissive:inputflinger=ok

-permissive:dhcp_exec=ok

-permissive:vcs_device=ok

-permissive:gpsd_exec=ok

-permissive:port=ok

-permissive:fuse=ok

-permissive:install_data_file=ok

-permissive:lmkd_exec=ok

-permissive:logd_exec=ok

-permissive:netd_exec=ok

-permissive:asec_image_file=ok

-permissive:recovery=ok

-permissive:radio_tmpfs=ok

-permissive:tee_tmpfs=ok

-permissive:wpa=ok

-permissive:dev_type=ok

-permissive:runas=ok

-permissive:vdc_tmpfs=ok

-permissive:wpa_tmpfs=ok

-permissive:hostapd=ok

-permissive:system_prop=ok

-permissive:vfat=ok

-permissive:fs_type=ok

-permissive:sdcard_external=ok

-permissive:sdcard_internal=ok

-permissive:sdcardd_exec=ok

-permissive:owntty_device=ok

-permissive:selinuxfs=ok

-permissive:tty_device=ok

-permissive:tun_device=ok

-permissive:clatd_exec=ok

-permissive:installd_tmpfs=ok

-permissive:uio_device=ok

-permissive:bootanim_tmpfs=ok

-permissive:install_recovery_tmpfs=ok

-permissive:sysinit_exec=ok

-permissive:system_app_service=ok

-permissive:full_device=ok

-permissive:null_device=ok

-permissive:fuse_device=ok

-permissive:usb_device=ok

-permissive:wfd_app=ok

-permissive:camera_device=ok

-permissive:hostapd_exec=ok

-permissive:keystore_exec=ok

-permissive:uncrypt=ok

-permissive:system_app_data_file=ok

-permissive:tee_device=ok

-permissive:uncrypt_exec=ok

-permissive:video_device=ok

-permissive:labeledfs=ok

-permissive:mtp_tmpfs=ok

-permissive:audio_device=ok

-permissive:radio_device=ok

-permissive:nfc_tmpfs=ok

-permissive:userinit_exec=ok

-permissive:ptmx_device=ok

-permissive:mdnsd_exec=ok

-permissive:system_app_tmpfs=ok

-permissive:bluetooth_data_file=ok

-permissive:usbaccessory_device=ok

-permissive:userinit_data_exec=ok

-permissive:lvm_placeholder=ok

-permissive:rmt_placeholder=ok

-permissive:nfc_prop=ok

-permissive:dex2oat_exec=ok

-permissive:socket_device=ok

-permissive:bluetooth_tmpfs=ok

-permissive:sysfs_lowmemorykiller=ok

-permissive:installd_socket=ok

-permissive:netd_tmpfs=ok

-permissive:servicemanager_exec=ok

-permissive:proc=ok

-permissive:asec_public_file=ok

-permissive:proc_cpuinfo=ok

-permissive:usermodehelper=ok

-permissive:bluetooth_socket=ok

-permissive:installd=ok

-permissive:debug_prop=ok

-permissive:inputflinger_exec=ok

-permissive:pan_result_prop=ok

-permissive:security_prop=ok

-permissive:zygote_socket=ok

-permissive:system_server_tmpfs=ok

-permissive:bluetooth_prop=ok

-permissive:ctl_rildaemon_prop=ok

-permissive:system_radio_prop=ok

-permissive:contextmount_type=ok

-permissive:lmkd_tmpfs=ok

-permissive:logd_tmpfs=ok

-permissive:uhid_device=ok

-permissive:ctl_dhcp_pan_prop=ok

-permissive:racoon_socket=ok

-permissive:ctl_bootanim_prop=ok

-permissive:wallpaper_file=ok

-permissive:install_recovery=ok

-permissive:net_radio_prop=ok

-permissive:asec_apk_file=ok

-permissive:console_device=ok

-permissive:userinit_prop=ok

-permissive:sensors_device=ok

-permissive:dhcp_prop=ok

-permissive:audio_prop=ok

-permissive:qtaguid_proc=ok

-permissive:ctl_bugreport_prop=ok

-permissive:healthd=ok

-permissive:init=ok

-permissive:sysinit=ok

-permissive:keychain_data_file=ok

-permissive:kmem_device=ok

-permissive:netif_type=ok

-permissive:gps_control=ok

-permissive:logd_prop=ok

-permissive:init_tmpfs=ok

-permissive:surfaceflinger_exec=ok

-permissive:kmsg_device=ok

-permissive:vold_prop=ok

-permissive:data_file_type=ok

-permissive:netif=ok

-permissive:bootanim=ok

-permissive:klog_device=ok

-permissive:zoneinfo_data_file=ok

-permissive:radio=ok

-permissive:inputflinger_service=ok

-permissive:mlstrustedobject=fail

-permissive:debuggerd_tmpfs=ok

-permissive:unconfineddomain=ok

-permissive:fscklogs=ok

-permissive:netd_socket=ok

-permissive:zygote_tmpfs=ok

-permissive:mlstrustedsubject=fail

-permissive:mediaserver=ok

-permissive:mediaserver_exec=ok

-permissive:ctl_fuse_prop=ok

-permissive:drmserver_service=ok

-permissive:mtpd_socket=ok

-permissive:debugfs=ok

-permissive:keystore_service=ok

-permissive:oemfs=ok

-permissive:pipefs=ok

-permissive:sockfs=ok

-permissive:sysfs=ok

-permissive:logd=ok

-permissive:pstorefs=ok

-permissive:default_android_service=ok

-permissive:drmserver_exec=ok

-permissive:inotify=ok

-permissive:vold_tmpfs=ok

-permissive:bluetooth_service=ok

-permissive:sysfs_devices_system_cpu=ok

-permissive:debuggerd_exec=ok

-permissive:untrusted_app=ok

-permissive:gps_socket=ok

-permissive:ueventd=ok

-permissive:node=ok

-permissive:proc_sysrq=ok

-permissive:adb_device=ok

-permissive:shared_relro=ok

-permissive:sysfs_type=ok

-permissive:system_data_file=ok

-permissive:alarm_device=ok

-permissive:camera_data_file=ok

-permissive:sysfs_bluetooth_writable=ok

-permissive:ctl_mdnsd_prop=ok

-permissive:hci_attach_tmpfs=ok

-permissive:devpts=ok

-permissive:sysfs_zram=ok

-permissive:audio_firmware_file=ok

-permissive:proc_bluetooth_writable=ok

-permissive:apk_data_file=ok

-permissive:audio_data_file=ok

-permissive:bluetooth_efs_file=ok

-permissive:dm_device=ok

-permissive:drm_data_file=ok

-permissive:gps_data_file=ok

-permissive:media_data_file=ok

-permissive:nfc_data_file=ok

-permissive:radio_data_file=ok

-permissive:tee_data_file=ok

-permissive:wifi_data_file=ok

-permissive:mdnsd_tmpfs=ok

-permissive:system_app=ok

-permissive:dumpstate_socket=ok

-permissive:sdcard_type=ok

-permissive:system_file=ok

-permissive:apk_private_tmp_file=ok

-permissive:hci_attach_dev=ok

-permissive:su=ok

-permissive:racoon_tmpfs=ok

-permissive:apk_tmp_file=ok

-permissive:proc_security=ok

-permissive:system_server_service=ok

-permissive:gps_device=ok

-permissive:gpu_device=ok

-permissive:nfc_service=ok

-permissive:gpsd=ok

-permissive:init_shell=ok

-permissive:mdnsd=ok

-permissive:device=ok

-permissive:system_wpa_socket=ok

-permissive:surfaceflinger=ok

-permissive:sysfs_nfc_power_writable=ok

-permissive:rild_tmpfs=ok

-permissive:isolated_app_tmpfs=ok

-permissive:runas_exec=ok

-permissive:untrusted_app_devpts=ok

-permissive:dex2oat=ok

-permissive:watchdogd=ok

-permissive:bluetoothdomain=ok

-permissive:dnsmasq_exec=ok

-permissive:fwmarkd_socket=ok

-permissive:qtaguid_device=ok

-permissive:inputflinger_tmpfs=ok

-permissive:shell_exec=ok

-permissive:ppp=ok

-permissive:dumpstate_exec=ok

-permissive:zero_device=ok

-permissive:resourcecache_data_file=ok

-permissive:systemkeys_data_file=ok

-permissive:shared_relro_tmpfs=ok

-permissive:binder_device=ok

-permissive:property_socket=ok

-permissive:sdcardd_tmpfs=ok

-permissive:hw_random_device=ok

-permissive:random_device=ok

-permissive:urandom_device=ok

-permissive:watchdog_device=ok

-permissive:ctl_default_prop=ok

-permissive:ctl_dumpstate_prop=ok

-permissive:security_file=ok

-permissive:media_rw_data_file=ok

-permissive:wfd_app_tmpfs=ok

-permissive:default_prop=ok

-permissive:debuggerd_prop=ok

-permissive:shared_relro_file=ok

-permissive:install_recovery_exec=ok

-permissive:coredump_file=ok

-permissive:netdomain=ok

-permissive:appdomain=ok

-permissive:lmkd_socket=ok

-permissive:logd_debug=ok

-permissive:racoon=ok

-permissive:graphics_device=ok

-permissive:serial_device=ok

-permissive:efs_file=ok

-permissive:powerctl_prop=ok

-permissive:rild=ok

-permissive:vold=ok

-permissive:adbtcp_prop=ok

-permissive:iio_device=ok

-permissive:ion_device=ok

-permissive:shell=ok

-permissive:tombstone_data_file=ok

-permissive:radio_service=ok

-permissive:apk_private_data_file=ok

-permissive:mdnsd_socket=ok

-permissive:service_manager_type=ok

-permissive:healthd_service=ok

-permissive:root_block_device=ok

-permissive:cache_backup_file=ok

-permissive:logd_socket=ok

-permissive:hci_attach=ok

-permissive:dalvikcache_profiles_data_file=ok

-permissive:sdcard_posix=ok

-permissive:vold_socket=ok

-permissive:block_device=ok

-permissive:zygote_exec=ok

-permissive:frp_block_device=ok

-permissive:radio_prop=ok

-permissive:loop_device=ok

-permissive:sysfs_writable=ok

-permissive:properties_device=ok

-permissive:misc_user_data_file=ok

-permissive:surfaceflinger_tmpfs=ok

-permissive:sysfs_ioscheduler=ok

-permissive:lmkd=ok

-permissive:nfc_device=ok

-permissive:servicemanager=ok

-permissive:sysfs_wake_lock=ok

-permissive:dnsproxyd_socket=ok

-permissive:rild_socket=ok

-permissive:shell_prop=ok

-permissive:keystore_data_file=ok

-permissive:ashmem_device=ok

-permissive:isolated_app=ok

-permissive:sysinit_tmpfs=ok

-permissive:shm=ok

-permissive:platform_app_tmpfs=ok

-permissive:rpmsg_device=ok

-permissive:shell_tmpfs=ok

-permissive:cache_file=ok

-permissive:fingerprint_prop=ok

-permissive:mtp_device=ok

-permissive:mtd_device=ok

-permissive:log_device=ok

-permissive:domain=ok

- Success

- System mode

mount: mounting /dev/block/mmcblk0p40 on /system failed: Device or resource busy

mount: mounting /dev/block/bootdevice/by-name/system on /system failed: Device or resource busy

- Disabling OTA survival

chmod: /tmp/supersu/arm64/chattr.pie: No such file or directory

/tmp/updater: line 1382: /tmp/supersu/arm64/chattr.pie: not found

/tmp/updater: line 1382: /tmp/supersu/arm64/chattr.pie: not found

/tmp/updater: line 1382: /tmp/supersu/arm64/chattr.pie: not found

/tmp/updater: line 1382: /tmp/supersu/arm64/chattr.pie: not found

/tmp/updater: line 1382: /tmp/supersu/arm64/chattr.pie: not found

/tmp/updater: line 1382: /tmp/supersu/arm64/chattr.pie: not found

/tmp/updater: line 1382: /tmp/supersu/arm64/chattr.pie: not found

/tmp/updater: line 1382: /tmp/supersu/arm64/chattr.pie: not found

/tmp/updater: line 1382: /tmp/supersu/arm64/chattr.pie: not found

/tmp/updater: line 1382: /tmp/supersu/arm64/chattr.pie: not found

/tmp/updater: line 1382: /tmp/supersu/arm64/chattr.pie: not found

/tmp/updater: line 1382: /tmp/supersu/arm64/chattr.pie: not found

/tmp/updater: line 1382: /tmp/supersu/arm64/chattr.pie: not found

/tmp/updater: line 1382: /tmp/supersu/arm64/chattr.pie: not found

/tmp/updater: line 1382: /tmp/supersu/arm64/chattr.pie: not found

/tmp/updater: line 1382: /tmp/supersu/arm64/chattr.pie: not found

/tmp/updater: line 1382: /tmp/supersu/arm64/chattr.pie: not found

/tmp/updater: line 1382: /tmp/supersu/arm64/chattr.pie: not found

- Removing old files

mv: can't rename '/system/etc/install-recovery.sh': Read-only file system

rm: can't remove '/system/bin/install-recovery.sh': Read-only file system

rm: can't remove '/system/etc/install-recovery.sh': Read-only file system

rm: can't remove '/system/xbin/su': Read-only file system

rm: can't remove '/system/xbin/daemonsu': Read-only file system

rm: can't remove '/system/xbin/sugote': Read-only file system

rm: can't remove '/system/xbin/sugote-mksh': Read-only file system

rm: can't remove '/system/xbin/supolicy': Read-only file system

rm: can't remove '/system/lib64/libsupol.so': Read-only file system

rm: can't remove '/system/etc/.installed_su_daemon': Read-only file system

rm: can't remove '/data/su.img': No such file or directory

rm: can't remove '/cache/su.img': No such file or directory

- Creating space

- Placing files

mkdir: can't create directory '/system/bin/.ext': Read-only file system

chown: /system/bin/.ext: No such file or directory

chown: /system/bin/.ext: No such file or directory

chmod: /system/bin/.ext: No such file or directory

rm: can't remove '/system/bin/.ext/.su': No such file or directory

/tmp/updater: line 1382: can't create /system/bin/.ext/.su: nonexistent directory

chown: /system/bin/.ext/.su: No such file or directory

chown: /system/bin/.ext/.su: No such file or directory

chmod: /system/bin/.ext/.su: No such file or directory

rm: can't remove '/system/xbin/su': Read-only file system

/tmp/updater: line 1382: can't create /system/xbin/su: Read-only file system

chown: /system/xbin/su: Read-only file system

chown: /system/xbin/su: Read-only file system

chmod: /system/xbin/su: Read-only file system

rm: can't remove '/system/xbin/daemonsu': Read-only file system

/tmp/updater: line 1382: can't create /system/xbin/daemonsu: Read-only file system

chown: /system/xbin/daemonsu: Read-only file system

chown: /system/xbin/daemonsu: Read-only file system

chmod: /system/xbin/daemonsu: Read-only file system

rm: can't remove '/system/xbin/sugote': Read-only file system

/tmp/updater: line 1382: can't create /system/xbin/sugote: Read-only file system

chown: /system/xbin/sugote: Read-only file system

chown: /system/xbin/sugote: Read-only file system

chmod: /system/xbin/sugote: Read-only file system

rm: can't remove '/system/xbin/sugote-mksh': Read-only file system

/tmp/updater: line 1382: can't create /system/xbin/sugote-mksh: Read-only file system

chown: /system/xbin/sugote-mksh: Read-only file system

chown: /system/xbin/sugote-mksh: Read-only file system

chmod: /system/xbin/sugote-mksh: Read-only file system

rm: can't remove '/system/xbin/supolicy': Read-only file system

/tmp/updater: line 1382: can't create /system/xbin/supolicy: Read-only file system

chown: /system/xbin/supolicy: Read-only file system

chown: /system/xbin/supolicy: Read-only file system

chmod: /system/xbin/supolicy: Read-only file system

rm: can't remove '/system/lib64/libsupol.so': Read-only file system

/tmp/updater: line 1382: can't create /system/lib64/libsupol.so: Read-only file system

chown: /system/lib64/libsupol.so: Read-only file system

chown: /system/lib64/libsupol.so: Read-only file system

chmod: /system/lib64/libsupol.so: Read-only file system

mkdir: can't create directory '/system/app/SuperSU': Read-only file system

chown: /system/app/SuperSU: No such file or directory

chown: /system/app/SuperSU: No such file or directory

chmod: /system/app/SuperSU: No such file or directory

rm: can't remove '/system/app/SuperSU/SuperSU.apk': No such file or directory

/tmp/updater: line 1382: can't create /system/app/SuperSU/SuperSU.apk: nonexistent directory

chown: /system/app/SuperSU/SuperSU.apk: No such file or directory

chown: /system/app/SuperSU/SuperSU.apk: No such file or directory

chmod: /system/app/SuperSU/SuperSU.apk: No such file or directory

rm: can't remove '/system/etc/install-recovery.sh': Read-only file system

/tmp/updater: line 1382: can't create /system/etc/install-recovery.sh: Read-only file system

chown: /system/etc/install-recovery.sh: Read-only file system

chown: /system/etc/install-recovery.sh: Read-only file system

chmod: /system/etc/install-recovery.sh: Read-only file system

rm: can't remove '/system/bin/app_process': Read-only file system

rm: can't remove '/system/bin/app_process64': Read-only file system

rm: can't remove '/system/etc/init.d/99SuperSUDaemon': No such file or directory

/tmp/updater: line 1382: can't create /system/etc/init.d/99SuperSUDaemon: nonexistent directory

chown: /system/etc/init.d/99SuperSUDaemon: No such file or directory

chown: /system/etc/init.d/99SuperSUDaemon: No such file or directory

chmod: /system/etc/init.d/99SuperSUDaemon: No such file or directory

/tmp/updater: line 1382: can't create /system/etc/.installed_su_daemon: Read-only file system

chown: /system/etc/.installed_su_daemon: Read-only file system

chown: /system/etc/.installed_su_daemon: Read-only file system

chmod: /system/etc/.installed_su_daemon: Read-only file system

- Restoring files

- Post-installation script

rm: can't remove '/system/toybox': No such file or directory

rm: can't remove '/system/toolbox': No such file or directory

- Unmounting /system

umount: can't umount /system: Device or resource busy

- Done !

I:Updater process ended with RC=0

I:Legacy property environment disabled.

Updating partition details...

I:Data backup size is 7446MB, free: 28981MB.

I:Unable to mount '/usb-otg'

I:Actual block device: '', current file system: 'vfat'

...done

I:Set page: 'flash_done'

I:operation_end - status=0

I:Set page: 'rebootcheck'

I:Unable to unmount '/system'

I:Unable to unmount '/system'

I:Copying file /cache/recovery/log to /cache/recovery/last_log

Rebooting...

I:InfoManager saving '/data/media/0/TWRP/.twrps'

I:Saved settings file values

Obviously it has something todo with the rw mount permissions of the system partition. It seems that the CUOCOS update script can't overwrite or replace the files:

ui_print("_________________________");

ui_print("LEECO OTA UPDATE CUOCO92");

sleep(5);

ui_print("Preparing update...");

show_progress(1.34,70);

mount("ext4", "EMMC", "/dev/block/bootdevice/by-name/system", "/system");

sleep(4);

ui_print("Patching system...");

package_extract_dir("system", "/system");

sleep(5);

ui_print("Cleaning...");

mount("ext4", "EMMC", "/dev/block/bootdevice/by-name/data", "/data");

delete_recursive("/data/data/com.otaupdater");

delete_recursive("/data/media/0/OTA-Updater");

unmount("/data");

sleep(10);

ui_print("Done");

show_progress(1.34,10);

sleep(5);

run_program("/sbin/reboot");

The script seems to fail during extraction of the package when it tries to replace the several folders under /system/...