Yo también creo que es necesario ser root:
El resultado
adb remount
adb server is out of date. killing...
* daemon started successfully *
remount failed: Operation not permitted
adb push AudioFilte
r.spf /system/etc/AudioFilter.csv
adb server is out of date. killing...
* daemon started successfully *
failed to copy 'AudioFilter.spf' to '/system/etc/AudioFilter.csv': Read-only file system