Here is the cruel irony: Even if you already own a Premium Netflix subscription, installing a modified APK can your quality. Because the modded app lacks proper Widevine L1 certification (due to code tampering), Netflix’s CDN will only serve you L3 quality – capped at 540p.
Downloading a Netflix Mod APK (such as version 7.38.0) is highly unsafe and legally problematic
If the cost of a Netflix Premium subscription is a concern, consider these legitimate free or affordable options: Stremio - Apps on Google Play