You can try towelroot. However, installing 4.4 will depend if a developer has built a ROM for that device. You can check Cyanogen, they have a pretty wide base of ROMs.
Hello
I need help
Telephone me zte z665c
Atchetgl programming for the network device is encrypted and I ask you to help me in the decoded
Expected of you reply as soon as
I Mehran from Yemen
Almapan Maazar Ali device dfs tool program tried every situation but Manjeh
I wish you every success
Digital [phone number removed by moderator]
Mahran, you can't decrypt an encrypted phone, except in the phone itself. (If you're talking about the password for wifi, you have to get that from the router - and if it's not your router, it's illegal in most countries for you to use it - even with the owner's permission.)