Sorry for your phone! I'm on a similar situation too, not exactly but due to same cause.
Actually my earpiece mesh was melted by the glue when I applied by myself a curved screen protector fixed with an UV loca glue. In my case the earpiece volume was not affected, so the earpiece membrane have same intensity.
Let me write my entire experience with this kind of screen protector with UV glue.
Actually I had 2 attempts to apply the screen protector. Always I tried to be very careful with the glue, I cleaned all the phone sides before placing the phone in UV light. I placed on top, on bottom and over the buttons of the phone tapes to protect that areas from the glue, but was not enough, the glue dripped under the tape.
1. On the first attempt, the glue had ruined my buttons, all buttons where damaged: volumes and power buttons. All buttons seems to be from metal but, buttons press on the micro-switches with some rubber fits, those were melted and the 1 of 3 micro switches were distroyied, the volume up. I ordered from *********** 2 sets of buttons and I replaced the ribbon cable and buttons.
Unfortunately the applied glass was not properly glued and after 3 weeks, the replacement buttons didn't arrived yet, it took 4 weeks to arrive, so the screen protector was almost lose. Most probably because the glue was not enough exposed to UV light ~5 minutes.
2. Because the screen protector became lose, I decided to replace the screen protector with a similar one. At the second time I tried to be even more careful with the glue. This time I didn't have problems with the buttons, but after some days I noticed that the earpiece mesh was disintegrating. I took a sharp middle and I tried to clean up the mesh residue from there.
As a consequence is that the whole earpiece hole is open like on the attached image. I'm not sure if there is another layer of fabric/mesh inside of the earpiece or there is nothing, only the membrane of the earpiece. I placed there a thingy strig of sponge for couples of months, but at the maximum volume the sponge had produced vibrations. So I removed the sponge and for almost a month the hole remained open.
So actually that's my question is there something which is protecting the earpiece membrane or the membrane itself is exposed directly?
Should I be worried by the hole being open and should I try to cover with something? I was tempted to order a frame to replace whole frame like you.
I'm asking that because I'm trying to not reopen yet my phone just to check that, for the moment the earpiece is working properly in my case.
OK, I'm back with some proper photos (even did focus stacking). So, under the earpiece hole you have there is a small "cavity"/"tunnel" and has its other end on the back side. On the other opening there is a bit of a probably t7000 glue (the sealing glue they ~use) and the earpiece (which is in a "module" where the top speaker is also mounted near) sits on top of it. The speaker has a very thin mesh (probably made of cloth or plastic). Thus, yours is kinda exposed. But the other 2 speakers ~only have that cloth/plastic mesh, so you probably don't make it much less waterproof (it already isn't). To change it, you would probably have to remove the glass back, unplug the battery and then remove the screen. You'd need to buy the mi 10 middle frame (~25euros) for that.
BUT you'll probably damage the screen in the process. Super amoleds are probably the worst. They have very thin films (polarizer etc. I think the digitzer is also a film glue onto it) and they can easily be damaged/split. You'll probably have to pay ~250euros to fix your screen as the original screen ~comes with the middle frame making it even more expensive and even if you only have somehow damaged only the front glass withoun any film, they may not risk it (the front glass costs around 30euros). What you may have to do is tell them to replace the
middle frame only, if they can take the risk of removing your screen. (Ask them to keep the old frame and give it to you because you ~get spare buttons/cables/fingerprint sensor etc. and can play with it.) Otherwise it may be left like this. You may want to put a tiny piece of tape or something if you want to protect it, but anyways.
I've realised that it would probably be much eassier if I had given it from the start to the repair shop to apply the uv glass themselves. I told them to apply it after they fixed my screen with the glass I had already bought and they ~told me the glue inside was unsuitable (probably) due to the bubbles which would stay under the glass and produce a bad result. They used their own glue.
I ~didn't know loca glue was corrosive btw, wow.
Btw, after they changed my screen I asked them to give me the old one (they ~were going to recycle it!) and now I ~caan test my skill and try to glue and glue the old screen on the old frame. I had bought ~all the tools apart from the heating pad (had an air soldering iron, but the pad was probably better). This, coupled with ~no experience ~caused this.
If you want to see the insides of the phone and how some probably
experienced people repair the device, some good ones are these (mi 10 pro is very similar to mi 10):
(very nice quality)
(russian? Well, ~as long as he tears down the device...)
(seems to be russian again
)
Please ~don't try to remove the screen on your own, they make it look easy.
(Btw I almost cut some part of the wireless charger coilon the back, phew it's ~OK...)
Now the ~fun part, Mi 10 anatomy! I'm providing some pics I took. (Btw, my earpiece is much louder now and the buttons more clicky!)
