Unfortunately, here I will provide an update on what I had written below about a year ago (approximately).

I was reading the reviews of others and now I am one of those who lost it in the sea...
Just when I was flying it nicely, suddenly it gave me a strong vibration detected warning, return to home, and I saw (from the screen because it was not in my line of sight) that it started to descend and then... black screen while I saw from the screen that it was probably falling. Unfortunately, I had it over the sea and it fell inside.

One mistake I made was that I didn't think about the fact that it has a log that tells you where it lost its signal last. I thought about it at night, saw that it fell not too far from the beach, went the next day with snorkeling goggles to maybe find it but... nothing. Maybe someone else saw it and took it because there were people with masks, there were a lot of seaweeds, so maybe it got stuck underneath and it would be hard to find or maybe it just fell somewhere and no one found it, not even me, like looking for a needle in a haystack. Not that it would work if I found it, but more for psychological reasons and maybe to save the memory card.

The reason it fell? Writing strong vibration detected warning, maybe it got hit by a gust of wind because it was 5 Beaufort, maybe it fell on a seagull (although I didn't see any at the spot and I think I would have seen it on the screen somehow), maybe it got damaged... who knows!
I will send the log to the headquarters in case I achieve something, but I don't think I have a high chance of getting a refund or getting a replacement. They will probably tell me that it was my own responsibility or that I shouldn't have flown it in windy conditions or that since it gave that warning, it hit something somewhere, well, some excuse. Anyway, I have to say that lately it had some issues with the brightness quality, which I didn't have in the beginning. Not that it matters, just part of the general update.
Overall, I didn't have many complaints, I flew it and it was relatively reliable, but since I don't have experience with other drones, maybe I can't compare.
Next, I will go for the DJI Mini 2 or 3... hopefully, I'll be luckier and more careful!

And I also received a nice response from the headquarters:

According to your file, the drone is out of the warranty period (12 months).
For this case, you need to buy a new drone fuselage by yourself.

Small update after purchasing the DJI Mavic 2 Mini: it is more reliable, I can fly it without any connectivity issues that I had before, and overall it seems more impressive. The only difference is that it is mini, so you need to be careful when and where you fly it, taking into account the wind, as it looks more like a toy. But other than that, so far, I consider the DJI Mavic to be better and it's true... you get what you pay for after all.

These are what I had written before it crashed:

I would like to mention that I am a beginner when it comes to drones, so forgive me in advance if I say something wrong (to the more experienced ones).

Before getting a drone, I wanted to get something like this so that I can learn and start playing. I didn't want to spend 1000-1500 euros and on the first flight, go and crash it into a wall and cry over my money.
I can say that I am generally satisfied.

Positives:
- Very good video quality in 4K, to the point where I am amazed by the footage.
-Compact, lightweight, easy to transport
-Durable - I've had a few accidents and it didn't get destroyed, so I consider that a positive
-Very easy to handle - I was afraid I would have trouble, but it doesn't require any special skills to handle it with stability and precision
-The battery lasts a long time
-Pretty good gimbal, stable even during abrupt movements
-Relatively quiet
-Updates and extra functionalities through the app. I've only used Orbit, Drone off, and Twirl, but it also has Find & Rescue, Track, etc.
-Price... it's not easy to find a good drone at such a price

Now let's move on to the negatives:
-Unfortunately, the range disappointed me a bit, based on the specifications. It easily loses signal many times and definitely doesn't reach 8km. It reaches a radius of 2-2.5km and then... RTH. Also, many times without any issues, even at 1km, it tells you that it's losing signal. I don't know if it's due to obstacles.
-A major issue with the app and the connectivity with the drone. Many times, because you have to position your phone or tablet, I had trouble connecting. I replaced the cable with another one, but still had issues. I don't know if it's related to the app, the drone, or the USB cable, but imagine having it ready to fly, connecting it to the drone perfectly, and... having no image! I'm still trying to figure out if I'm doing something wrong.
-It has given me some minor problems like needing calibration, requiring a reset, etc., but I think those are within the program since I didn't have a case. I should mention here that I was able to buy additional propellers, a band to secure the propellers, a protective cover for the camera, and you can also purchase other things like protective covers for the propellers, a special case, a takeoff base, etc. If you catch the bug, you easily get carried away...

Also, an update... I accidentally drained the battery, but that was mostly my fault because I flew it in high temperatures (35-40 degrees) for about 22-23 minutes. The good thing is that it showed a battery problem during the return, so I managed to land it before it fell into the... sea! For some reason, it couldn't recharge the battery, so I watched some videos on how to reset the battery, I did it... but nothing. What I learned is that we need to check the temperature from the controller to be sure. I simply bought a new battery and everything is fine (for now).

Well, I'm making an unpleasant update.
After so many flights, without any issues, etc., the time has come for something bad to happen.
Just when I turned it on and started flying (perfect weather, locked onto 16 satellites, drone and controller batteries fully charged as always, etc.), at a height of 9 meters and 20 meters away from me, it loses signal and crashes to the ground. Three out of four propellers break, one axis is damaged, and the battery flies off as it falls and gets bent, and now it won't connect again. Also, there's a small scratch on the gimbal (not to mention the scratches on the drone body, etc.).
Disappointing. I sent an email to the Chinese company and explained the situation, sent videos and photos, etc., and I'm waiting for a response (although I don't expect much from them).
It's a shame, I didn't expect something so bad to happen and for it to be damaged due to signal loss. It didn't even activate the Return to Home feature, it just crashed to the ground. Luckily, there were no people around and I didn't have it flying high. Simply tragic. I won't buy Xiaomi Fimi again, I'm already looking for a DJI Mavic.
I revised my evaluation because what happened was extremely dangerous.

*update
After 3 weeks of endless photos, emails, and constantly writing about what has happened, I sent all the flight logs, etc., etc., etc. The official response from Fimi was to send it at my own expense for them to inspect it in person, or alternatively, to get the spare parts myself and repair it!!!!!! They wouldn't even provide the spare parts for me to pay for the repair in Greece. They are scammers. Stay away if you don't want to go through the same thing. I threw it in the trash and felt relieved. Over 500 euros wasted. Never again will I even buy a screw from Chinese manufacturers!

Well, the drone in its category (especially from the outside) is the most value for money you can buy even for professional use.
POSITIVES:
- Very good build quality and we realized it when we had a frontal collision with a wall and the only thing that happened was 2 broken propellers. As soon as we saw it, we said "THAT'S IT" and yet it seemed like it never hit the frame (of course not at maximum speed).
- Very stable even in conditions that are not ideal.
- Very good image quality in videos, both in resolution and stability.
- Many modes to play with and have a variety of shots in your videos.
- And of course, the price for everything it offers.
- We tested the range up to 2.3 kilometers and did not lose signal, while it claims up to 5 kilometers.
- Amazing battery. It lasts 24 minutes in normal use comfortably, while we know from others that if you don't spare the battery, you can get 29 minutes.
- It is foldable, so it is convenient for transportation.

OVERALL, A VERY GOOD DRONE and we also have a detailed video with functions, unboxing, and everything you need to know.
https://www.youtube.com/watch?v=3fiFE-BOa5M&t=1s

NEGATIVES:
- At this price, you really can't find anything bad to say about this tool. We want to say negatives, but when you think about the price and the rest of the competition, you can't say anything without being considered strange, I believe... Honestly, it's the most value for money.