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You might try flashing the ROM again, just using the bootloader. (Since you mentioned mtty11a.exe, I assume that's what you might have done the first time.) The thing is that the 27xx is a bit tricky to put into bootloader mode. As Cybrid points out, you have to press Contacts+Messaging+Reset, let go, wait until it stops loading. You'll see a message "USB is connected." Press Calendar. Now you should see "USB" (all by itself). If you don't, do it over until you do. When you get it right, mtty11a or HPRUU will work (hopefully).
If the bootloader section is hosed, then you don't have much choice but to send it into HP. Chances are they won't really replace the MB. More likely they'll just use the hardware contacts to reflash the ROM.
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HP 210 + 16GB SDHC + 32GB CF (48GB!) + Bluetooth GPS + Bluetooth phone-as-a-modem
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