TP-Link m7310 User Manual page 31

A PUK (PIN Unlocked Key), also known as Personal Unlock Code (PUC), is used in 3GPP
mobile phones to Reset a personal identification number (PIN) that has been lost or forgotten.
The PUK is a SIM-specific code assigned by the service provider. If a user does not know his or
her PUK and is prompted for it, it should be obtained from the service provider.
On the page as shown above, first enter the PUK code and then set a new PIN to unlock your
SIM card as well as any device with it inserted.
4.4.1.4. ISP Update
You can update the ISP information on this page.

ISP Version: The current ISP Version.
If you want to update the ISP information, please follow the steps below.
1) Download the latest ISP update file from the Support page at www.tp-link.com to your
M7310 LTE-Advanced Mobile Wi-Fi User Guide
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