Hi, this is a known issue for v3.0 images of the ZCU111 and ZCU208 boards. We have a fix for this that will be applied in future image builds mac addressing fix for zcu111 and zcu208 (#17) · Xilinx/RFSoC-PYNQ@9396d96 · GitHub. If you don’t want to build a new image from that branch then Jenny’s method is likely the easiest solution in the interim.
Thanks
Shawn