Zyxel NSA310 - questions after Debian install (3 replies)

Hi,
Thanks to this forum, I successfully installed Debian on my box. Thank you!
I have some questions without answers even after reading many posts. Maybe I just didn't find them.

1. ethernet MAC address is `00:00:00:00:00:30` despite the fact it is set in setenv:

enp1s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet [redacted IP]  netmask 255.255.255.0  broadcast [redacted IP]
        inet6 fe80::200:ff:fe00:30  prefixlen 64  scopeid 0x20<link>
        ether 00:00:00:00:00:30  txqueuelen 1000  (Ethernet)
        RX packets 16  bytes 2575 (2.5 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 36  bytes 5093 (4.9 KiB)
        TX errors 0  dropped 1 overruns 0  carrier 0  collisions 0

root@nsa310:~# fw_printenv ethaddr
ethaddr=50:67:XX:YY:ZZ:XY

2. for the interface name the only solution was to name it `enp1s0` as in this tutorial.
When trying as in forum post didn't get any result.

rename /end0=eth0
auto lo eth0
iface lo inet loopback
iface eth0 inet dhcp

What am I doing wrong?

3. is it possible to enable caches mentioned when the box is starting?

SoC:   Kirkwood 88F6281_A1
DRAM:  256 MiB
WARNING: Caches not enabled
NAND:  128 MiB

4. is it any solution to boot from HDD in case USB is broken? like a failsafe mechanism.

5. did anyone succeed to install OMV on the latest Debian? The tutorials are for Debian Stretch and OMV4 but didn't work for me with Bookworm and OMV4.
It this isn't working, how are you managing RAID?

Thank you