@bnorwood Then you can either try older iPXE binaries. Go to github and pick an earlier commit from this list: https://github.com/FOGProject/fogproject/commits/master/packages/tftp - use the < > button to browse the repository at that stage and grab the binaries from packages/tftp/…
If you can’t find a working binary you’ll probably need to get into debugging it as suggested in the topic mentioned in my last post.