$150-ish Xiaomi Redmi Note 7 Global Rom version already support widevine L1.

I don't watch Netflix or Amazon prime so I didn't know what this widevine thing is.

But I could find some question about it in Xiaomi MIUI Official Forum which currently merged with Mi Community.

Xiaomi flagship Mi 8 is still L3.

Mi 8 is Xiaomi flagship smartphone line--Mi series which was released last year and this year, Xiaomi released Mi 9.

So people are saying Mi 8 is Xiaomi's flagship smartphone but why Mi 8 don't support widevine L1 which is important because L1 device only support HD in Netflix and Amazon prime.

Screenshot of Xiaomi Mi 8's DRM Info 1/2

Screenshot of Xiaomi Mi 8's DRM Info 2/2

If you see the first screenshot, you can see the Mi 8's firmware version info. - 10.3.2.0 which is Miui global stable newest version.

And L3 from the second screenshot.

You can read about Widevine from Wikipeida

or I will just quote from important part from Widevine digital rights management explained @ December 11, 2017

Android devices support either L1 or L3 security levels, depending on hardware and software implementations, as does Chrome OS. 

If your device is only L3 compliant, you're capped at sub-HD resolutions. Only L1 secure devices.....play back HD or higher quality content...

Redmi Note 7 launched in Korea and it's widevine L1.

Xiaomi Redmi Note 7 was launched in Korea at April 15, 2019. And this model probably is same model like European version which had global version.

Xiaomi Redmi Note 7 Korean version - Global Version.

After launched in Korea, I heard that Redmi Note 7 support widevine L1 from Xiaomi community in Korea. But I don't have a Redmi Note 7 to screenshot myself.

And I just bought it a few days ago so I did capture the screen.

Screenshot of Xiaomi Redmi Note 7's DRM Info 1/2

Screenshot of Xiaomi Redmi Note 7's DRM Info 2/2

You can see the Redmi Note 7's firmware version info. - 10.2.8.0 which is Miui global stable version.

And L1 from the second screenshot.

HD streaming isn't available yet in Netflix, probably.

I don't subscribe to Netflix so I don't know.

But some people are saying HD streaming wasn't available in Redmi Note 7 which suppose to work because it support widevine L1.
But I heard that you can download HD video files in Redmi Note 7.

I don't know much about this so you should ask about it to Netflix.

And you can check Netflix's help page about the "Using Netflix on your Android phone or tablet".