[Xiaomi Redmi Note 4 Questions & Answers] MyNameIsRage:
Yes i guess so, tell this to the seller.

---------- Post added at 06:52 PM ---------- Previous post was at 06:50 PM ----------

How long has it been since xiaomi gave you permission? You need to wait. Nothing else will work. Even though it fails at 99% you just need to wait for some days. It will come. Just keep trying.

---------- Post added at 07:17 PM ---------- Previous post was at 06:52 PM ----------

Hey there robin.

You surely seem excited mah boii?, ok so as you asked, the three questions, here is my detailed answer. (I've been using the custom roms since the launch of nougat roms for mido, so yes i have a good knowledge regarding them)

1. You said you want to take good photos.

Tbh with you, miui gives the best performance, with usage of the camera. The shutter times are quick, and you get support for slow mo too, but it doesn't allows you to shoot at 4k 30fps, so a workaround this is using the modded google camera. I've been using the scrubber gcam mod available, as my daily camera app, and other than slow mo, everything works GREAT! The portrait modes are damn cool, even though it can only detect human. So if you don't want slow mo really, then yes google cam is the way to go (you can also sideload gcam if you wish to use miui)

2. Yes as you asked about 4k, every other camera other than stock miui camera supports for shooting at 4k 30fps.

3. Now aptx hd is something I'm not quite sure about. Some people say it is working. Some people say it isn't. I know that aptx hd is something which google started supporting natively in android oreo, but I'm not quite sure if it is working currently. What i can assure you is, later down the year, there sure are going to be mods much more immersive made for aptx to be used in redmi note 4.

Now the final part.

--what rom should you use?--

Basically there are two major versions available, 7.1.2 nougat and 8.1.0 oreo.

Nougat roms are super rock solid Stable, since there development is officially closed, as the devs are working on oreo updates. Now basically currently nougat allows a plethora of customisation, with roms like resurrection remix and aosp extended, and these roms provide camera apps, which can shoot 4k and slow mo.(they have a camera app known as snap camera). Now don't get me wrong, oreo 8.1 is also stable, but it is lacking some customisation. Also 8.1 has some bugs, which may or may not affect you. Like for my personal preference, i always rebind the hardware keys, to custom actions, like double pressing the recents button to take a screenshot, and these customisations are present in nougat roms, and this was my desired feature for an oreo rom, and it is actually now available in aosp extended oreo, but then this rom aosp extended 5.1 has some problem with toast message, the content isn't affected, but the shape of toast message is weird.

Now yes to your answer, there is no "best rom" for you.

Also the major thing you gain by installing a custom rom is PERFORMANCE, like upto 10x more performance than miui, amd yes of course the world of customisation. And on the losing part, you don't really lose much, except for some miui related features like second space or etc.

So my suggestion to you would be that, take your time, use your device as it is for about a month, get a taste of miui, and meanwhile apply for unlocking permission, so you can get it. After you feel like done with, miui, unlock your bootloader, install twrp and firstly install some nougat roms, (i will suggest you to install resurrection remix 5.8.5 final, cuz it is the best among nougat roms for performance, and customisation), after about 2 or 3 months, when oreo roms start showing up more and become super stable. Install one.

You need not worry about battery life since it is more or like the same as miui.

Now all this is just my suggestion to you, but testing roms and being patient is something nice (only if you are careful).

So, there you have it.

---------- Post added at 07:22 PM ---------- Previous post was at 07:17 PM ----------

Wait a minute, you are missing on stuff related to firmware. What model you have Snapdragon or mediatek? Have you ever flashed firmwares? If it's mediatek, then nothing much can be done, but if it's Snapdragon, something can be done to fix it. We can troubleshoot together if you tell properly like, how you flashed twrp and what version and how you install a rom.