Just wanted to warn everyone about how difficult it is to deal with the operator of the firmwareinfo site / service. If you make the slightest mistake in submitting some very detailed information, you will be banned (no second chances.) If you don't respond to the invitation e-mail before midnight in the time zone in which the site operates on the the day that you request your account, you will be banned. If you request firmware for more than one player, you will look suspicious, and you will be banned. If the firmware update fails and bricks your player, you go buy a new player, and you request a free firmware for the new player, you will be banned. Basically, if you do anything that causes the slightest inconvenience to the operator, you will be banned. If you're familiar with The Soup Nazi from Seinfeld, you get the idea.
It's also important to note that if a new firmware version comes out for your player, the factory update will overwrite your custom firmware and you will have to pay for a new custom version of the new firmware. So obviously, you want to disable automatic firmware updates in the settings menu.
Here are some quotes from forums discussing the issues dealing with firmwareinfo:
<blockquote>This guy is really unbelievable. After several attempts to apply for his firmware for donations of up to 100 Euros per device, he flat out refused to give me anything more than only one firmware. I donated 50 Euros to him for this, and offered 300 Euros for my three other players, all while agreeing to follow his instructions and template to the letter, and promising and assuring him that I will not contact him again for support or any other reason. He flat out turned this down.</blockquote>
<blockquote>For my 310 he wanted a 40 Euro donation and he stipulated it must be sent as a gift (guess so you couldn't claim it back if there are any problems). Anyway I was going to take a chance when I got in from work but my account was cancelled by him 30 mins after he sent payment instructions (guess he didn't like waiting).</blockquote>
<blockquote>Reading through this thread, I think i've been sufficiently put off by the idiosyncrasies of firmwareinfo to avoid trying to modify my player.</blockquote>