You first must upgrade de vCenter Server, after the SRM and then the ESXi hosts, check this KB article for update sequence: VMware KB: Update sequence for vSphere 5.5 and its compatible VMware products
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You first must upgrade de vCenter Server, after the SRM and then the ESXi hosts, check this KB article for update sequence: VMware KB: Update sequence for vSphere 5.5 and its compatible VMware products