MyPBX U520 root password reset

Hello. I forgot ssh root password on my MyPBX U520.
I want to reset in by editing the /etc/passwd file.
How do i do it? Can i interrupt boot of Linux system and edit the boot point (like GRUB's e)?
Or i need other ARMv71 distro to boot from (arch linux arm via usb or something like that)? Please help!


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