can not do an downgrade because i buy the phone with WP7.8 instaled from Vodafone Italy...I just make the reset on the Factory setting.
I have the same problem, Lumia 800 Vodafone unlocked and with the upgrade Windows Phone 7.5 to 7.8 share data connection it's not working.
¿Is it solved or there are some tips and trick to solve this?.
Thanks so much and best regards!.
Me too having the same problem after upgrading to 7.8. Wonder how nokia and MS released the upgrade with serious bugs like this. Did any one get any work around for this.
I am from India and my carrier is !dea. My phone is not a locked one.