From what I've seen it looks like they are willing to help you. I didn't pay for the software but I'm willing to buy it if it works. I've done some research and found that it does work and I've used it. I'm not sure if I can be sure that it is the right tool but I didn't find anything else. I can't go to the source since I don't have the tool.
HP offers a fairly complete set of tools for firmware updates on their web site. You can find them here: http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?os=40_41&lc=en&product=3778583&lang=en&cc=us#hpc
Once you are logged in, you can run the DMIFIT tool from CD and then plug in the battery and run the HPBQ138 tool. It will ask you to initialize your display, so do that. Then it will ask you for the capacitors, I think the first and last, then the BIOS will be reset and you will get the HPBIOS image. As long as you don't disconnect the battery, you can just press the F2 key to get to the Advanced Boot Options screen and select HPBIOS and you should be good to go.
From memory you need to remove the battery for a short time to get the BIOS runnign as it has to set the battery off. I don't know how long but I think it is a few seconds. Once you see the logon screen then if you have a password, use it to log on. If you are using a Dell or similar, you will need to use their tool to remove the battery (Dell utility for example).
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