Is libc.so universal for x86_64 Openwrt device？

[ChowDPa02k]

I know it's a strange question.
But here's something more strange:

Recently I bought a Nas device, which using Openwrt as firmware...
CPU N6005, version 22.03 built with private snapshot, no firmware image released public (even factory firmware).

Found that anything installed from opkg cannot run, with error "not found"

I figured out why, using ldd check library link, output are as follows:

root@UGREEN-CD13:~# ./list-user-installed-packages.sh 
ca-bundle
iptables-nft
libustream-openssl20201210
lscpu
rsync
tailscale
tailscaled
root@UGREEN-CD13:~# cd /usr/sbin/
root@UGREEN-CD13:/usr/sbin# ldd iptables-nft
        linux-vdso.so.1 (0x00007ffe6a3fd000)
        libiptext.so => /usr/lib/libiptext.so (0x00007fcb07cd5000)
        libiptext_ebt.so => /usr/lib/libiptext_ebt.so (0x00007fcb07cd0000)
        libiptext4.so => /usr/lib/libiptext4.so (0x00007fcb07cc6000)
        libiptext6.so => /usr/lib/libiptext6.so (0x00007fcb07cbc000)
        libiptext_arpt.so => /usr/lib/libiptext_arpt.so (0x00007fcb07cb7000)
        libmnl.so.0 => /usr/lib/libmnl.so.0 (0x00007fcb07cb0000)
        libnftnl.so.11 => /usr/lib/libnftnl.so.11 (0x00007fcb07c80000)
        libxtables.so.12 => /usr/lib/libxtables.so.12 (0x00007fcb07c70000)
        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00007fcb07c5c000)
        libc.so => not found
        libc.so.6 => /lib/libc.so.6 (0x00007fcb07a63000)
        libc.so => not found
        libc.so => not found
        libc.so => not found
        libm.so.6 => /lib/libm.so.6 (0x00007fcb07989000)
        /lib/ld-musl-x86_64.so.1 => /lib64/ld-linux-x86-64.so.2 (0x00007fcb07cec000)
root@UGREEN-CD13:/usr/sbin# cd ../bin
root@UGREEN-CD13:/usr/bin# ldd rsync 
        linux-vdso.so.1 (0x00007ffcc21cb000)
        libz.so.1 => /usr/lib/libz.so.1 (0x00007ff4e36d5000)
        libpopt.so.0 => /usr/lib/libpopt.so.0 (0x00007ff4e36c8000)
        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00007ff4e36b4000)
        libc.so => not found
        libc.so.6 => /lib/libc.so.6 (0x00007ff4e34bb000)
        /lib/ld-musl-x86_64.so.1 => /lib64/ld-linux-x86-64.so.2 (0x00007ff4e36eb000)
root@UGREEN-CD13:/usr/bin# ldd lscpu
        linux-vdso.so.1 (0x00007ffe9339d000)
        libsmartcols.so.1 => /usr/lib/libsmartcols.so.1 (0x00007f6c58ca3000)
        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00007f6c58c8f000)
        libc.so => not found
        libc.so.6 => /lib/libc.so.6 (0x00007f6c58a96000)
        /lib/ld-musl-x86_64.so.1 => /lib64/ld-linux-x86-64.so.2 (0x00007f6c58cd6000)
root@UGREEN-CD13:/usr/bin# lscpu
-ash: lscpu: not found

I've contacted with the consumer service, got the response that they didn't build firmware with library libc.so at all. I think they meant to do it, to avoid user from installing custom packages.

So if I have no any source from device, can I just copy a libc.so from another system of similar architecture, like N5105 x86_64? Or anyway to recover it?

[slh]

It is not, even less when it comes to vendor provided firmwares (who seems to have chosen a non-default glibc based build, instead of OpenWrt's default of using musl). There isn't even binary package compatibility between different versions of OpenWrt (even less for the libc), when it comes to 3rd party or proprietary builds all bets are off.

[frollic]

install proper openwrt instead ?