I have been performing 34by151's mods on a US version X910Bt here in OZ. I have stuck to all instructions with very little issues.
I am still sorting the BT issue with the modified skin though, as when i delete the items in the igo/save folder they reappear after reboot. MSN is not active but every so often it searches for a connection, i am assuming this is part of thie issue.
Otherwise the unit inc BT works flawlesly with the original skin with the last V3UPDATE03. mod copied over and the latest R17 maps. I have not changed SYS.TXT as Before and after the the mod there are at multiple sys