[beerandt]

You have to also revert the play services app and then disable it, in addition to reverting the launcher app.

I've got some other apks disabled as well, but I think these two are the critical ones.

I haven't had the ads pop up again in over 2 weeks.

[somethingwitty1]

I'd be curious if it depends on when you purchased the shield. I just tried this on my older shield reverting/disabling worked, but my newer one does not.