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Most Coolsand/RDA chips enter Meta Mode (engineering/download mode) when connected to USB without being turned on.
RDA All In One Tool Collection For Mobile and Smartwatch Free
The tool serves as a lightweight application to manage hardware identifiers on RDA-based smartphones, tablets, and even smartwatches. It is highly useful when a device displays an "Invalid IMEI" message or fails to connect to cellular networks after a factory reset or system update.
