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Old 06-24-2012, 04:51 PM   #1 (permalink)
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Unhappy 8820 OS Update problem

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I bought a 2nd-hand unlocked AT&T BB 8820 OS 4.2 from the USA. It works fine on my local South African GSM-networks but as soon as I update it to OS 4.5 I am unable to make calls or access BIS. It just displays the message 'no service'.

Please help.
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Old 06-24-2012, 05:03 PM   #2 (permalink)
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Default Re: 8820 OS Update problem

Resend the service books (see the FAQ) and do a battery pull.

If that doesn't work, call your cell carrier.
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Old 06-24-2012, 07:34 PM   #3 (permalink)
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Default Re: 8820 OS Update problem

Also check to see if it really is unlocked.

How do I determine if my BlackBerry is "unlocked"? - BlackBerryFAQ
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9810 BES
Z10 on BES
9700 BIS
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