Here it is download the HTC One Android 4.2.2 OTA update stock firmware 2.24.401.8. This is for those who still got the custom recovery and not been able to receive the 2.24.401.8 update via OTA. You grab this firmware and manually flash it via recovery. This update brings the said HTC mini+ and the official Google keyboard support.
This stock firmware are for European unbranded HTC One only (with corresponding correct CID numbers). Again, you may only use it at your own risk!
Thanks to [Oum] via XDA-developers.