Hi,
You can find a step by step guide on how to hard reset your phone here :
How to restore your BlackBerry Z10 when it won turn on
Testimonial: "thanks very much. I did but at the greed light i was asking me for a PIN n dat i do not have. I entered a wrong PIN many times n now its gives me and error massage."
SOURCE: blackberry 9000 stuck on black screen
you need to reload the OS completely...
just use firmware + desktop manager
flash it
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