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127	127	Install the downloaded pack in Keil
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130	130	4: Add the Device, then you can **rebuild** the project.
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132	132	[[image:image-20220526181509-13.png]]
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134	134	rebuild project
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137	137	Note: If you don’t add the Device, then Keil will report this error:
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139	139	[[image:image-20220526181543-14.png]]
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168	168	Support Frequency
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171	171	If you want to change frequency, modify the Preprocessor Symbols. For example, change EU868 to US915 to complie a US915 firmware.
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173	173	[[image:image-20220526181651-17.png]]