If it's not prompting you to continue updating the BIOS, and you don't have any problems, then it installed correctly. I understand your anger too. Flashing a BIOS should be left to technicians who know the risks, and the procedure. From now on, just make sure you read the details of what software your installing. I can't stress that enough. Many times we just want to click and be done with it, but that's a really bad practice.
If anything, you can learn from this experience, and take something posative from it.