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Mi has officially provided only Screenguard and flip cover for mi max 2. If you are using a flip cover then screenguard is enough. But if you want better quality tempered glass, then you will have to search online shopping sites.
I have searched a lot but most of them are cheap and if it is good then it doesn't cover the whole screen.. This is the problem of 2.5d curved glass.. Tempered glass aren't able to cover the full screen and it brings bubbles in the glass
But that flip cover is based on glue.. and I saw that glue will come out after some days of using
Have been using the flip cover along with Screenguard for around 4 months now and it has protected my device well. The glue cover doesn't come out until you peel your device out of it. But the flip cover edges have gone under lots of wear and tear which I have already complained to mi. Still it's the only good option available at present.