23 June 2020
UPDATE (June 3rd, 2020):
OnePlus has officially announced that it is aware of the OnePlus 8 Pro issue where some users have not been able to stream Netflix in HD quality. It told Gadgets360 that the team is working on a fix which will be released as an over the air (OTA) update. It is hopeful of releasing the update by the end of June.
Original (June 2nd, 2020)
The OnePlus 8 Pro has one of the best smartphone displays out there, especially for media streaming. It offers a Super AMOLED display panel with HDR10+ support. While it is an ideal display for content consumption, a few of the OnePlus 8 Pro users are complaining about the inability to stream content in HD quality.
A number of OnePlus 8 Pro users have shared this unexpected experience on official OnePlus forums. It is expected that the HD streaming issue started to appear after OxygenOS 15.5.5 update but has also been spotted in build 15.5.6. The reason for the issue is the demotion of the Widevine DRM certification.
All smartphones are needed to have Widevine L1 certification for being able to stream HD content. This certification is used by various streaming service providers like Netflix, Amazon Prime Video, and Hulu. It is reported that affected OnePlus 8 Pro units have had their Widevine L1 certification downgraded to Widevine L3. This is the reason they are unable to stream content in HD or HDR and have been limited to SD.
As of now, OnePlus has not been able to fix the issue through software updates. There are reports that it has asked affected users to ship their units to service centers for further inspection. We will be updating this story as soon as OnePlus is able to release a fix or it offers an official statement on the matter.