No. The "top" download for the Yeacomm P11 refers to the latest stable production release. Avoid beta or engineering builds unless you are a developer.
Sometimes, but not reliably. Newer firmware may add IMEI editing features (check your local laws), but the primary goal is performance, not circumvention. yeacomm p11 firmware download top
Solution: You downloaded firmware for a different revision (e.g., V2.0 firmware on a V1.0 router). Double-check your hardware sticker and search again. but the primary goal is performance