OpenWRT for Pix-Link and Chinese Repeaters - is there any way?

Hello friends, can you please use OpenWRT on Pix-Link and Chinese repeaters?

I'm trying but I can't, is there anything to help me?

Here are models that would be great to have OpenWRT in them:

They are cheap equipment that with OpenWRT would be perfect...

Thank you very much hugs.

this is another model

Probably dead end, due to low RAM and flash sizes.