System.img dump possible without root ?

[kitnoos2002]

Hello !
I have a ZS570KL (SD820 64GB) with special SKU TIM.
Before overwrite TIM_system.img with WW_system.img I have a question :
Is there a way to dump TIM_system.img on my non-rooted device ?

Thank's

 

[macsax]

Hello !
I have a ZS570KL (SD820 64GB) with special SKU TIM.
Before overwrite TIM_system.img with WW_system.img I have a question :
Is there a way to dump TIM_system.img on my non-rooted device ?

Thank's

I have tried to backup the stock partitions (boot, recovery and system), but w/o unlock the device the partitions are untouchable, no read or write from/to... no permissions...