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+**How to choose a serial number?**
+
+First of all, is necessary **select a DSM model before**: [Choose a DSM model](https://github.com/fbelavenuto/arpl/wiki/Choose-a-DSM-model)
+
+
+Go to main menu and select the "Choose a serial number" option:
+
+![image](https://user-images.githubusercontent.com/11461290/203082979-a0d41ed7-fd16-4d2c-8b83-4298abb75a1b.png)
+
+Is possible to type a serial number manually or let the loader generate one randomly (recommended):
+
+![image](https://user-images.githubusercontent.com/11461290/203083330-3596309b-b15c-4fe7-b49d-0c4897fd2df8.png)
+
+If your choose type manually, type the serial number on this screen:
+
+![image](https://user-images.githubusercontent.com/11461290/203083496-2059db58-a85b-4136-800c-a395a73a88eb.png)
+