Can the OPI5 be Configured to Run LCNC?

To improve the latency by the way, you could add the following to /boot/armbianEnv.txt :
extraargs=cma=128M isolcpus=5,7

I've just tried to compile it and it seems to work fine, do you have the following file?
/usr/lib/linuxcnc/modules/hal_op5_io.so

In case you don't have that file you could try to copy the already compiled file (hal_op5_io.so from the zip file) to "/usr/lib/linuxcnc/modules/"

Yeah, I do have the hal_op5_io.so file in that directory.
Now I'm getting this error:
Thread 'base-thread' not found.
does it mean something wrong with my hal_op5_io?

Means there's an issue with your config, could be a typo.

Posting hal & ini helps.

Here's my hal and ini file.
The whole error is attached too.
 

Your hal file in missing the lines that load the base & servo thread. And few other bits & pieces.
At the start of your hal file you'll need something like this

And you need to sort out the issue withThis could be the file not existing or you don't have the correct permissions to access the file. Unfortunately as the whole error log isn't there, just a screenshot or a small part, I can't comment any further.

Yes Thanks a lot. That was the problem
and also after correcting that, "mv: cannot stat 'dev/ttyFIQ0'" doesn't show up anymore too.
Thank u