When I unboxed it poped all the time then i lost a piece when it poped and I dont know what to do

This cube was good at first baut pops and then it is complicated to put back together.

It popped the first minute I got it lol

This cube has amazingly smooth turning and is currently my main but it has so many major pops about one every 25-50 solves. If it dosen't have a major pop it will most likely have a pop where an internal edge pops out. The popping aspect of the cube is why I'm rating it 4 stars.
I would recomend the kung fu one over this, but this is my main because I can't be bothered to buy the kung fu one over this because this was given to me for free by a friend.

OOTB, this cube was gummy, slow and pops a TON. However, it is still extremely smooth and flows really well. After setting up with weight 4 on the core and a bit of weight 2 and DNM-37 on the pieces, tightening about 2 screws and breaking in with about 1000 solves, this is extremely fast, smooth and flows very well during algorithms and is the closest feeling cube to a OP Dayan it also is my main over the Dayan and has brought me to a PB avg of 2.53 which is my first sub 2.6 avg and a PB single of 0.56. Pros - Cheap, flows extremely well and is the smoothest cube I have tried. It is also very lightweight and can be picked up very fast in a competition from the stackmat. Cons - For a large audience, POPS. For many people who have tried my YuXin White, they always manage to pop it wherelse I have never popped it before after tightening it. Although that might be turning style as I have a very light and accurate, yet fast turning style. Also because of the lightweight, it is slightly more prone to slipping out of your hands compared to heavy cubes like the Dayan. Overall I believe this is the true Dayan Kller if you set it up really well. Thanks for reading my review!

The first 50 unsetuped solves it popped like crazy! But after setting it up it was O.K, but it still popped for the next 100 solves(not that much). Then I wiped it out and set it up again. It was great! so after 1000 to 1500 solves later it was really smooth. then wiped the cube down and set it up again. And after 500 or so solves it literally felt like an old plastic dayan 2x2!!! Great cube if you like to set up cubes and breaking in your cubes!! I could of give it 5 stars now but 4 stars because of the popping at the start.

It pops in the first day I got it and it is hard to assemble

Alright, I didn't actually get one of these, my friend did. So, where do I start? Overall, this cube is perfect for the price you pay. While it's very, very gummy, it is super controllable. I average sub-10 with a 2x2, but this is really helping me knock it down. I can't emphasize enough that it is gummy. Now I like a controllable cube, because during a speed solve, it doesn't help to overshoot and mess up on an alg, but this cube doesn't even need to be tensioned, unless you don't like the turning. It may feel slow, so loosen it up a little, but overall, this is the best 2x2 I've seen yet. Certainly worth the wait.

When I got this cube two months ago, I averaged about 7 seconds.
Now, with a little bit of DNM-37, I average high 4 to low 5 using Ortega, LBL, and a few CLL algs. I am only telling you this because since I got this cube, I learned 1 CLL alg,(diag pi), and yet my times dropped insanely. This cube is so much better than my old main, the Cyclone Boys, which was very scratchy and sluggish, which is not a good combination. The only bad thing is the internal pops that you might get once every 75 solves or so.

My first 100 solves were great. It was smooth, corner cutting was good, and it was stable.
After the first 100 solves it was awful. It popped EVERY solve. I may have broke something internally, but it is trash!