> i dont want to install desktop environment.
 > just base installation + working network +
 > openbox.

None of the ISOs come with a desktop environment installed by default, 
but you can install one with setup-desktop. The standard ISO should be 
fine.

 > running qcow2 on LIMBO EMULATOR ARM 6.0.1 (QEMU 5.1.0).
 >
 > my android device:
 > 2GB Exynos 7870 Octa SoC 16GB Storage

So I guess you want the aarch64 standard ISO.