How to install unsigned apps

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Hello! Facing a new problem. I've tried on every site that that generates certificates an key for mobiles including opda, s60certkey.com and one more chinese website. But none is generating certificates for my nokia 5230 device. Its been a long time i've applied for the certificates. I wants to know whyany site is not generating certificates for nokia 5230. How else can I hack my nokia 5230 to install unsigned apps on my mobile device?