Since its launch at MWC conference this year, the HTC One M9 has been runningAndroid 5.0 Lollipop out-of-the-box. However, some Lollipop features, such as Guest Mode, were seen missing from the handset. Now, an HTC developer has tipped that the next major update for the smartphone will bring that feature, alongside the colour temperature feature. According to LlabTooFeR, …