Why does only one of the screws come out of my iPhone?

I have an iPhone 4 with a really scratched back and there's a scratch over the camera so I've ordered a new back offline which came with a screwdriver and I managed to take one of the screws out the bottom with no problem but the other screw would only come up a little bit but not all the way, so I screwed it back into place to try and screw out again but now it won't even come up slightly. Does anyone know why this is or how to make it come out. I've replaced my back before and the screws came out fine that time so I don't know why they wouldn't work now?

Anyone that has iphone 4 and their contract is up, should be on iphone 4S at least because 4S is free on a 2 year contract. Plus on trade in you would also get credit back for the 4.

  • Why is no sound coming out my iPhone. The only sound that comes out is the ringer or when I have headphones hooked up? I have a iPhone 6s. And I recently noticed that no sound is coming out my iPhone. The only sound that works is my ringer and when I have headphones hooked up. My phone is updated to the IOS 12. I tried cleaning out my headphone jack and speakers and it's still doing it.
  • Why does only one speaker work when I connect my iphone to my Hi Fi system? I brought a brand new Hi Fi system today, tested in the shop with my iPhone connected and it worked fine, both speakers working. I tried it when I got home and now only one speaker works when my iPhone is connected using the audio in cable. Both speakers work fine when a CD is playing, why is this happening?
  • Why does only one speaker work on my iphone? Its been bothering me since it came out of the box. The right speaker at the bottom works just fine but the left, I never get a sound out of it. Is my iphone defective or maybe there's a setting to fix that? I don't know
  • Why does only one speaker on my iPhone 4 work? My boyfriend has the same phone as me only he has not had it as long as me. When we play music on his phone both speakers work. But on mine the left one doesn't work. I have never damaged my phone. Always had a protective case on it. I'm very easy on it. What's wrong with mine? Could it have been messed up from the start? Or is there a thing I can change the setting. I checked the music In the settings and the speaker thing is in the middle.