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| Scenario | Recommendation | Why? | | :--- | :--- | :--- | | Stable Standalone/Autonomous AP | Use JPN1 | Highly stable, fewer bugs than newer "JY" trains which sometimes introduced radio driver issues. | | Critical Security Focus | Upgrade to 15.3(3)JY11+ | While JPN1 is stable, later JY releases contain critical security patches (CDC advisories). | | Mobility Express (Virtual Controller) | Use 8.5.140.0 or 8.10 | The 15.3 code is for Autonomous mode. If you want the AP to act as a controller, you need the 8.x code train. | | Roaming (802.11r/k/v) | Use 15.3(3)JPN1 or newer | Handles fast roaming protocols reliably without the "association failed" bugs of older versions. |

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If you are the one asking whether ap3g2k9w7tar1533jpn1tar is better, here is actionable advice: | Scenario | Recommendation | Why