Picked mine up 2 days ago and sure enough it was L3. Some of the posts here stated that Oppo told them that the mainboard needed to be changed / they swapped the device however i can now confirm this is not a hardware issue.
Took mine back to the Oppo service centre the very next morning and they fixed it within 30 minutes. When i walked in, the frontdesk customer service representative didn't even know the issue. In fact they didn't even know what Widevine was.
1. Prior to sending and after , my firmware version remained the same which is - CPH2025_11_A.23 ( June security patch - latest version as of now )
2. Phone was not reset when i collected it back 30 minutes later. Every app and settings remained the same as well.
When i asked them what was done to fix it, they told me that they contacted Oppo China and they were given a file to install and reconfigure. Upon further questioning ie what file and can i have a copy of the apk, they declined to answer and stated it's due to privacy reasons.
Firmware version images :
Widevine before and after :
TL;DR : From the looks of it , this can definitely be fixed with a software update. Just hope that some media picks this up so that Oppo is aware as for now when you email them, all they ask you to do is either reset your phone or clear netflix cache data. Spending so much on a phone only to enjoy Netflix and Amazon Prime content in SD is utterly ridonkulous.
Hope this helps, although there's no Guide, i hope this thread picks up traction and OPPO realizes that this is a common issue.
Edit : Check this post for the fix : https://forum.xda-developers.com/sho...17&postcount=5