Administrative Regulations on Low Power Radio Waves Radiated Devices Article 12

Without permission granted by the NCC, any company, enterprise, or user is not allowed to change frequency, enhance transmitting power or alter original characteristic as well as performance to a approved low power radio-frequency devices.
中文原文 低功率電波輻射性電機管理辦法第12條
經型式認證合格之低功率射頻電機,非經許可,公司、商號或使用者均不得擅自變更頻率、加大功率或變更原設計之特性及功能。

English translation for reference only; the Chinese text prevails. Not legal advice.