-cst says that the iPhone has the most signal and calls do not come-you are recommended to update-you are recommended to restore settings-send https://support.apple.com/es-es/HT203977-Sebd DFU https://support.apple.com/es-es/HT201263-cst contact if the problem persists after trying everything-next advisor -repair options
sendo traduzido, aguarde..
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