for over two months of using my nokia E71, i can only install few jar app n anytime i try insatllin sis file, it gives responds of application error or file unable to install,i cant use watsapp n many oda apps on d phone. Even wen i dwld app to hack d phone it wont install,pls help me out.?

brother just format d phone and you are good lol! Switch off the phone,then hold down key *,3 and the call key then switch it back on.don't release them till you see the nokia logo.

@Poster.Go to my thread,check the last page,there lies your solution.H@ck your fone in a jiffy and install all u ever wanted to.

thanks man ll try formatin da fone.

I guess most of the applications you're trying to install are cr@cked versions.Follow HonSule's thread and see if there's any positive outcome.If it doesn't work,you might have to hard-reset your device.

U don't need to hard reset, format your fone. All you gotta do is hack your fone and say goodbye to certificate errors and contact supplier wahala. Just wanna help u bro, i know how annoying it must be for you cos i'v bn der. Just email me and i'lll send u every thing u need to hack your fone successfully. Here's my email address: jimmy_brown007@yahoo.co.uk

guys blieve me,i know what he's talking about! It's not the normal certificate errors that has to do with hacking et al,this kind of problem don't allow you install any symbian application nor game,it keeps showing you 'file corrupt' even for signed applications lol! Formatting is the TRIED and confirmed solution-unfortunately

@Valon4ego, but you did not explain if formating would erase all applications you already got on your phone. Pls speak. Thank

Before formatting,make sure you remove both the memory card and sim. All the stuffs in your phone memory'll be removed. After formatting put back the memory card and switch on,some application that were stored in memory card'll automatically install but not all. Just install d rest. The rest of the stuffs on memory card remains intact. You can back up your phone memory files before formatting sha