I was downloading a bios upgrade from the HP website for my HP HX4700 PDA for Windows Mobile Second Edition and everything stopped working and now only the HP Invent logo and V1.01 appears on the screen along with the words Serial or USB. I have done resets and still nothing.

I'd ask them here. http://social.answers.microsoft.com/Forums/en/group/mymobilephone Regards, Dave Patrick .... Microsoft Certified Professional -Microsoft MVP [Windows]

Hi, Please perform Dave’s suggestion. If the issue continues, please contact HP for the further research. Best Regards, Vincent Hu