I am also a Lenovo Xiaoxin Pro (2020) users. My ROM is also now TB-J706G_S620150_211226_ROW (after OTA upgrade). But after the OTA upgrade, I am now facing Widewine issues with Netflix. Any bros have any suggestion how to solve this? I had attempt to flash the latest ROM (version as above) via Lenovo rescue tool but failed.
Attached the two pictures from DRM info app and Netflix playback config.
U are already on the latest rom and should have no problems with drm in most subscription apps. But sadly I cannot help u further as I don't use Netflix. Perhaps other bros who use Netflix can help.
Some people factory reset, install other builds of Netflix from APKPure, etc to resolve this.