http://www.2valor.com/Service/dface/ERIZ520.asp
na paaiskint ten sunku, jei is paveiksliuku nesupranti, bandyk ieskot video ar kitu paveiksliuku, per google suvedus "z520 disassembly" va viedo kazkoks https://www.yall.net/phone-disassembly/z520i-disassembly.html o jei nesuprasi tai meistrui teks nest