XPeria X10i cannot be recognized in Flash mode
So I have a SE XPeria X10i which is working on Android 1.6, I believe. However, I want to flash it to 2.1 so I can unlock it (that's what I need to do, right?). Right now, I only have the emergency call button when I turn on the phone. When I insert my SIM card, it asks for a network PIN.
I turned off my phone. Removed its battery and put it back in after ~10 seconds. I pressed the back button and hold it while I was inserting USB cable. However, even after holding it for 30+ seconds, my computer still doesn't recognize it. I installed all drivers on both of my computers (one with Win 7 and one with Win XP), but no success.
Am I doing something wrong? Is there any fix?