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| Issue | Symptom | Solution | |-------|---------|----------| | | Code is rejected as “invalid” | Re-check original carrier. If bought second-hand, use a database lookup service. | | Firmware too new | Device accepts code but remains locked | Downgrade firmware using Huawei’s HiSuite (risky) or request a “direct unlock” (server-side). | | Exceeded attempt limit | Message: “Code permanently blocked” | Requires a specialized service (resets counter via flash box). | | Damaged SIM reader | “No SIM” error even after unlock | Hardware repair needed. | | Regional lock | Unlocked but no service abroad | Some devices have a “regional lock” (e.g., Middle East version). Use a local SIM for 15 minutes first. |

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