No firmware will work if all chips are not found.
Yeah, the Bitmain style testers like the Zeus tester are painfully slow for troubleshooting. I started using the Asic.Repair tester (
https://tester.asic.repair/en), which will run the count test in a loop indefinitely, giving you all the time you want to probe the test points.
I saw those sell online. So these models do loop uninterrupted? I wasn't really sure so I doubted to buy one due to the higher price...