[Sony Xperia M5] LCYE234:
Also, I tried the rooting method stated, no success. Attached is the recovery log for the failed attempt to get systemless root. Please advice.

*****************
SuperSU installer
*****************
- Mounting /system, /data and rootfs
mount: mounting /dev/block/mmcblk0p23 on /data failed: Device or resource busy
2+0 records in
2+0 records out
2 bytes (2B) copied, 0.005125 seconds, 390B/s
3+0 records in
3+0 records out
3 bytes (3B) copied, 0.002917 seconds, 1.0KB/s
10+0 records in
10+0 records out
10 bytes (10B) copied, 0.002893 seconds, 3.4KB/s
0+0 records in
0+0 records out
0 bytes (0B) copied, 0.004442 seconds, 0B/s
/tmp/updater: line 765: /system/toolbox: not found
- Extracting files
Archive: /sdcard/SuperSU-root-BETA-v2.67.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/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/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 v2.67 (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=ok
-permissive:debuggerd_tmpfs=ok
-permissive:unconfineddomain=ok
-permissive:fscklogs=ok
-permissive:netd_socket=ok
-permissive:zygote_tmpfs=ok
-permissive:mlstrustedsubject=ok
-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
- Detecting system compatibility
sukernel v2.67 (ndk:arm64-v8a) - Copyright (C) 2014-2016 - Chainfire

Loading from [/dev/block/mmcblk0p10] ...
Could not find header
- System-less mode, boot image support required
- Creating image
/data/su.img: clean, 23/2048 files, 1318/8192 blocks
- Mounting image
mknod: /dev/block/loop0: File exists
CANNOT LINK EXECUTABLE: cannot locate symbol "error" referenced by "/system/bin/toolbox"...
page record for 0x7fb1b34010 was not found (block_size=64)
- Creating paths
mkdir: can't create directory '/su/bin': File exists
mkdir: can't create directory '/su/xbin': File exists
mkdir: can't create directory '/su/lib': File exists
mkdir: can't create directory '/su/etc': File exists
mkdir: can't create directory '/su/su.d': File exists
- Removing old files
- Placing files
rm: can't remove '/su/bin/su': No such file or directory
rm: can't remove '/su/bin/daemonsu': No such file or directory
rm: can't remove '/su/bin/supolicy_wrapped': No such file or directory
rm: can't remove '/su/lib/libsupol.so': No such file or directory
rm: can't remove '/su/bin/sukernel': No such file or directory
mkdir: can't create directory '/su/xbin_bind': File exists

******************
Boot image patcher
******************
- Finding boot image
--- Boot image: /dev/block/mmcblk0p10
- Extracting ramdisk
sukernel v2.67 (ndk:arm64-v8a) - Copyright (C) 2014-2016 - Chainfire

Loading from [/dev/block/mmcblk0p10] ...
Could not find header
--- Failure, aborting

*************************
IMPORTANT NOTICES
*************************
If TWRP offers to install
SuperSU, do *NOT* let it!
*************************
First reboot may take a
few minutes. It can also
loop a few times. Do not
interrupt the process!
*************************

- Unmounting /system
- Done !
I:Legacy property environment disabled.
Updating partition details...
I:Data backup size is 3156MB, free: 7933MB.
I:Unable to mount '/usbotg'
I:Actual block device: '', current file system: 'auto'
...done
I:Set page: 'flash_done'
I:operation_end - status=0
I:Set page: 'clear_vars'