Apps not displaying is one problem that often happens to huawei mobile devices. In this case you need to download the firmware of that particular model and install on the device with the help of the PC

Super glue is one thing nobody will ever love to mess with because of how stubborn it can be. One should notice that getting rid of the super glue should be done with care. Gently soak rubbing alcohol on the affected part for some minutes and gently remove the glue with something very sharp like a blade. U can also use break fluid if available

Yes, it is possible for repairs if the damage is not that much but can be too if it is severely damaged