unlock o2 xda with serial lead

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I have an o2 xda and wish to unlock it the proble is i'am unsure if it in the boot loader mode. how do i know?
I'am using win xp could this be the problem. when i plug the lead in i get a message from hosysnc on the xda that it trying to connect is this right?

thanks

If you get a message from Actove Sync (?) on the XDA, it's most definitely not in bootloader mode.

Gently press stylus the warm-reset (large hole, bottom left) while turning it on.

thanks for the reply it got it unlocked now. once i knew how to get into the boot loader setup