We’ve ordered a RPi 5 and will have it next week so we can test.
What I meant to say is that having your actual hardware at hand would allow us to make sure it’s working before sending it back to you. Chances are we will get our RPi 5, and the firmware will pass all tests, but then it doesn’t give us any information about why it doesn’t work on your end. It’s not that we can’t afford to buy an RPi 5, it’s pretty cheap and affordable, the issue is reproducibility: that if it works with our RPi 5, it won’t give us any information about why it doesn’t work for yours.