Meus cumprimentos, em vez de Atualização, chama-se Downgrade ou pode-se dizer desatualizar.  No entanto, esta ação não é recomendável uma vez que a raiz de ficheiros do sistema sofrerão alterações novas. Voltar ao sistema anterior pode ocorrer mal a mudança de ficheiros para o  quebrando totalmente o celular. No entanto, tal operação só pode ser feita por um expert em smartphones e que o mêsmo garanta-lhe que vai funcionar.

The only test you can do to verify the source of the problem is to perform call screening, play a song, insert a headset. When no solution is found, you may need to replace the sound output card as indicated in the above response. However, iphone is a very sensitive device and I only recommend that you open it if you are experienced.

There are two ways to update a device´s android version. Via OTA which is to update via the internet and by na USB with a computer. If you updated via OTA and the tablet face these problems it´s correct to afirm that your device is not suit to this version of android. If you update via USB with a computer software, the method has to be considered unofficial. You are not recommend to update.

The internet consumes a lot of computer RAM. If you installed a new system the computer remains slow on the internet so you are using a operating system version that your computer does not suit. Solutions: - Install a recommended operating system version. If you are using windows 8 or 10, note that the ideal RAM is 4GB and a Dual Core or higher chip. - Install windows 7. - Open the task manager, see the processes that are consuming the memory. For example, the computer may be updating.

The devices capable of producing some sound inside a normal laptop are the fan and the hard drive. When the fan is not attached properly, due to some screw or broken part, then there will be reasons for noise. In the case of the hard disk, this only makes a noise when tired. Solutions: - securely fasten the fan and make sure that all the connectors are secure; - remove the hard drive and check if the noise continues; - disconnect the fan connector and check if the noise continues;