Weighing in at around 85MB, the update is currently hitting the handset's European units.
This means Samsung should also release a new Gear VR version that works with USB Type-C.
The listing for the Samsung SM-J210F also reveals 1.5GB RAM.
This was revealed by HTC's Senior Global Online Communications Manager Jeff Gordon on Twitter.
BlackBerry had already said that select carriers will offer the upgrade starting May 3.
A price tag of RMB 1,999 (around $310) is being rumored.
The device has already received approval from Chinese telecommunication authority TENAA.
Both Three UK and Amazon are saying that the device will be released this Friday.
In India, Micromax's sub-brand Yu has had an exclusive deal with Cyanogen since 2014 as part of which the former has been launching Cyanogen OS-powered phones.
Alleged iPhone schematics leaked too. Meanwhile the next Moto X got benchmarked, and a Xiaomi Mi5 open sale in India sold out in minutes.
Meet the HTC One S9, Meizu m3, Huawei Honor 5C and the ZTE Blade L5 Plus.
A swap on the podium, iPhone 5s returns to the chart.
The HTC hype has been real lately, so we bring you our latest giveaway where you can enter for a chance to win an HTC 10.
HTC is now looking to get the update approved within the next couple of weeks.
The latter was at the top for almost three years.
Replying to a user query on Twitter, Microsoft's Gabriel Aul said that it's a common request, and asked the user to upvote it in Feedback Hub.
The device was previously rumored to be made official in April-May time-frame.
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