If you determine to flash BIOS, you are taking a personal risk of BIOS flash failure.
Because BIOS flashing is potentially risky, if you do not encounter problems using the current version of BIOS, it is recommended that you not flash the BIOS. Inadequate BIOS flashing may result in system malfunction.
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You could also install a version of Cyanogen Mod on the device, I believe that allows you to use wifi to authenticate.
I found this tutorial on how authenticate via wifi, but keep in mind, this device is a couple years old now and I don't know if the files needed are still available.
Power on you Laptop and press the corresponding function key to enter into BIOS/CMOS Setup. Download and install the HP System Software Manager (SSM) version sp2095.exe* from here keep in mind that this SSM version, works better with Windows 7, Vista or XP) b. This below method to reset the BIOS password, is tested to the following HP laptop models (Source): HP Elitebook 2530P, HP Elitebook 4310S, HP Elitebook 4510S, HP Elitebook 6930P, HP Elitebook 8460P, HP Elitebook 8530W, HP Probook 2230S, HP Probook 2560P, HP Probook 2730P, HP Probook 2740P, HP Probook 6460B, HP Probook 6455B, HP Probook 6535B, HP Probook 6550B, HP Probook 6730B, HP Probook 6735B, HP Probook 8440P, HP Probook 8530P, HP Probook 8540, HP Probook 8560P, HP Probook 8560W, HP Probook 8560W, HP Probook 8730W 1.
Unable to connect to HP WMI namespace" (see the screenshot below), then follow the steps below: a. Navigate to the BCU location "C:\Program Files (x86)\Hewlett-Packard\SSM", from the command prompt window. Then type the following command: * If you want, replace the letters pwd in quotes with a desired password. BCU should respond, "Successfully Modified the Setup Password.". Reboot your computer and enter BIOS Setup with the password you given.
But now I cannot even "adb shell" to copy other update files to the SD card. Thanks, You can follow this guide to bypass the activation screen.
It requires reverting back to RC29 ROM (downgrading back to 1.0), and having ADB and HTC drivers installed on your PC.
Some times there is the need to reset bios password, in order to be able to enter the BIOS and modifying its settings (e.g. This BIOS Reset procedure on a desktop computer is a relatively easy process, because in most cases all you need to do is to remove the power cord and the CMOS/BIOS battery In the other hand if you own a Laptop, the procedure to reset the BIOS/CMOS setup password, is more complicated especially if the CMOS battery is not easy accessible.
This tutorial lists all the available ways to remove/clear the BIOS/CMOS password on a HP Probook, Elite or Pavilion Laptop.
But the update failed and now the problem is that I cannot boot the phone completely. Although, I don't have a T-Mobile SIM card now, I could pass that stage with an AT&T SIM card. When I press menu button it just shows me the settings for APNs.