[Galaxy S6 / S6 Edge Unified Development] Noa~:
I've been handed a 925F that someone tried installing this ROM on.

They had no clue what they were doing and I have no clue what they've done, the installation ends with error 7.

symlink: some symlinks failed

I haven't messed about with ROMs and Rooting for years, does anyone know what step is missing or how I should proceed from here.

Log, some extraction snipped to get within char limit.

AROMA Installer version 2.70RC2
(c) 2013 by amarullz xda-developers

ROM Name : XtreStoLite Deodexed Mod Edition S6 ROM
ROM Version : v.1.3 - KKU1AOE6
ROM Author : edgarf28
Device : Samsung Galaxy S6 G92xF/I
Start at : Tue Jun 2 10:25:49 2015

unmount of /system failed; no such volume
unmount of /cache failed; no such volume

****************************************
XtreStoLite S6 Lollipop ROM Installation
Made by Edgarf28
****************************************
Preparing Installation...
Mounting Partitions...
about to run program [/sbin/mount] with 4 args
about to run program [/sbin/mount] with 4 args
about to run program [/sbin/mount] with 4 args
Cleaning before the installation begins...
about to run program [/tmp/cleanaddons.sh] with 1 args
about to run program [/tmp/wipe.sh] with 1 args
rm: can't remove '.' or '..'
rm: can't remove '.' or '..'
Extracting New System...
/*EXTRACTION SNIPPED*/
Flashing G925F Edge Stock kernel...
about to run program [/tmp/mytweaks.sh] with 2 args
Adding WiFi scan interval build.prop tweak...
about to run program [/tmp/mytweaks.sh] with 2 args
Adding Faster Sensor/dialer delay build.prop tweak...
about to run program [/tmp/mytweaks.sh] with 2 args
Adding Faster bootanimations build.prop tweak...
about to run program [/tmp/mytweaks.sh] with 2 args
Extract: /system/etc/init.d/99sqlite
Extract: /system/xbin/sqlite3
Extract: /system/etc/tools/runsu.sh
Extract: /system/etc/tools/runsuremove.sh
Extract: /system/etc/tools/supersu.cfg
about to run program [/tmp/add_initd.sh] with 1 args
Enabling Call Recorder in the Dialer...
about to run program [/tmp/mod_csc.sh] with 2 args
Adding the Secondary symbols to the Samsung Keyboard...
about to run program [/tmp/mod_csc.sh] with 2 args
Enabling the Camera shutter sound button in the Camera app...
about to run program [/tmp/mod_csc.sh] with 2 args
Adding Exit button to the S-Browser app...
about to run program [/tmp/mod_csc.sh] with 2 args
Adding Extra Quick Toggles...
Extract: /system/etc/tools/run.sh
Extract: /system/etc/tools/runremove.sh
about to run program [/tmp/add_initd.sh] with 1 args
Enabling alphabetically sorting of the TouchWiz app drawer...
about to run program [/tmp/mod_csc.sh] with 2 args
Disabling Auto correction on the Samsung Keyboard...
about to run program [/tmp/mod_csc.sh] with 2 args
Extract: /system/etc/tools/runs.sh
Extract: /system/etc/tools/runsremove.sh
about to run program [/tmp/add_initd.sh] with 1 args
about to run program [/tmp/modlast_csc.sh] with 2 args
run_program: execv failed: Permission denied
run_program: child exited with status 1
Applying default build.prop tweaks (Screen mirroring fix & 100% JPG Quality tweak)...
about to run program [/tmp/mytweaks.sh] with 2 args
Settings Permissions & Symlinks...
symlink(): created [/system/app/Bluetooth/lib]
symlink(): created [/system/app/Bluetooth/lib/arm]
symlink: failed to symlink /system/app/Bluetooth/lib/arm/libbluetooth_jni.so to /system/lib/libbluetooth_jni.so: Operation not permitted
script aborted: symlink: some symlinks failed
symlink: some symlinks failed

Installer Error (Status 7)

End at : Tue Jun 2 10:26:02 2015