Repurposing BQ E4.5

[rick0x1]

I'm trying to turn a BQ E4.5 into something like a pi-hole and a dlna proxy.
I have installed unbound on a libertine chroot but I can't start unbound, even on an unpriviledged port.

the only output I get is

[1580931346] unbound[6378:0] warning: setrlimit: Operation not permitted
[1580931346] unbound[6378:0] warning: cannot increase max open fds from 1024 to 4140
[1580931346] unbound[6378:0] warning: continuing with less udp ports: 984
[1580931346] unbound[6378:0] warning: increase ulimit or decrease threads, ports in config to remove this warning

after the that unbound just quits.
I this possible without changing the system to RW?

[rick0x1]

I rebooted destroyed the chroot, created a new one and was able to bind port 5353.