EM7455: How do the FW image and PRI Image differ from each other?

IoT Modules
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EM7455: How do the FW image vs PRI Image differ from each other?

Additionally, What is relationship between both of the files?

How do I add a PRI file for a new carrier?

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Fw image is big , about 60 MB, it includes the telecom stack
PRI setting nvu file is the setting of the network carrier such as apn or frequency band supported

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Thanks!

Please confirm the default values of “AT+CGDCONT” result are part of the PRI.

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Not all pri will change apn