Maybe there is a misunderstanding: rSAP works with a G2 without my app
. This seems to be an undocumented feature, because LG doesn't list rSAP as a supported Bluetooth profile, as you learned from LG support. Nevertheless It's there
If it does no longer work for you, it is most probably a problem limited to you and maybe other users, since it works for some. That's why I thought my phonebook app can fix it. If not you may still try a different SIM card.
My app most probably does not work because LG uses a different interface for the radio software. My software assumes the "standard" interface and crashes. This is all guessing from your description, I didn't have the opportunity to check a G2 myself.
You can do one more thing to find out what goes wrong: please try to create a "HCI snoop log" or a HCI log with my logger app and mail it to admin at ... The only thing is, we may learn what goes wrong, but you will most probably be unable to fix it