Default How I can recover my HP 6915?

Hi!

I have a HP 6915 since a few years ago, now, when I power on it only shows the HP logo and a "Local mode" message, if i plug it to USB port, this changes to "USB Mode".

The problem is that the official Spanish rom Update 1.50 from HP doesn't detect de device, and UNI_bootloader and other methods that I have view in XDA Forumdoesn't work for me.

Any sugestions? Other softwares? Would I try it on other OS as Windows XP?