Some carrier versions of the HTC One M8 and One M7 will face delays in receiving the Android 5.0 Lollipop update, the company has announced.

HTC previously promised to deliver the update within 90 days of the source code availability, but it has now acknowledged that it will not be able to meet the deadline. Those 90 days end on Feb. 1, and it will take a bit longer for the update to roll out.

To be fair, HTC has made significant efforts to deliver the update in a timely manner. The company has already rolled out Android 5.0 Lollipop to its One M8 in Europe, and the GPE, developer, and unlocked versions of the smartphone got the update earlier this month.

At the same time, HTC is unable to meet the 90-day deadline and deliver the Android 5.0 Lollipop to all carrier versions of the One M8 and One M7 smartphones.

"In the spirit of continued transparency, I wanted to share a quick update on where we're at with our Android Lollipop rollout process. We've been working hard in the labs with Google and our carrier partners ever since the code release and are making great progress so far, but if you've been following the progress of this rollout you will know that Google has had to address several issues with this release. We've been diligently working to fix some of them on our end and incorporating Google's fixes as quickly as possible, but despite everyone's best efforts some carrier versions of the HTC One (M8) and HTC One (M7) will not meet our 90 day goal, which is February 1st," HTC's Mo Versi acknowledged in a new announcement.

"While we are committed to delivering within this time period, we are even more committed to ensuring these updates result in an even better experience with your device because that is what the updates are intended to do."

In other words, HTC wants to deliver the update as soon as possible, but at the same time it prefers to delay the rollout rather than pushing a software version with glitches and bugs. Google has been constantly updating the source code since its release, and HTC is still trying to keep up.

"We are continuing to push hard to deliver Lollipop to all devices as near the 90-day mark as possible, but we are taking every precaution to ensure the rollout is right and we aren't willing to compromise at your expense. As of today, we've rolled out to Google Play, Unlocked, and Developer Editions of the HTC One (M8). We're still working through the testing process with our partners and hope to have good news to share soon. We promise to keep you updated in real-time as additional devices receive the update on our Software Updates page and @HTCUSA on Twitter."