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How to reset Sonim XP1520 BOLT SL?

Phone powers on to Sonim (built for life) & that is as far as it goes

I cant open handphone password 


hi. I bought a LN- SONIM XT1520 on e-bay. its lockt to at and t , wich is a problem since I live in Norway and have use a norwegian phonecompany. Iv been catting with at and t about unocling it, but the np (nuc) codes the have given me doesnt work. I have only to tryes left on my phone. What chall I do ?

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