HMD global already promised that all of its Nokia android smartphones including the low end Nokia 3 will receive at least 2 major OS upgrade. The company also promised that it will try to roll out the latest android Oreo update to its smartphones before the end of the year.
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HMD already starting fulfilling its promise few weeks ago when it rolled out the android 8 Oreo update to Nokia 8 users, now the CPO of HMD, Juho Sarvikas has just announced in a recent tweet that the beta version of the android 8 Oreo update has started rolling out to Nokia 5 users.

According to his recent tweet, he wrote;

#AndroidOreo for #Nokia5 has landed on Nokia phones beta labs! Android has never tasted sweeter.
What's more, Android 8.0 Oreo™ beta for #Nokia6 is coming soon! http://nokia.com/phones/betalabs
10:53 AM - Dec 12, 2017

Going by his tweet, the Nokia 6 is definitely the next in line to receive the update followed by the low end Nokia 3 smartphone. If you happen to own a Nokia 5 and will like to upgrade to the beta version of the android 8 then you have to participate in the beta program by clicking on this link to complete the registration.