Hi OSynce,
I just tried it. Works like a charm for me 
Did you map your unhashedPassword field correctly? Screenshot by Lightshot
That’s how my profile looks like: (you can import it)
{
    "name": "default_customers (Kopie)",
    "type": "customers",
    "tree": {
        "id": "root",
        "name": "Root",
        "type": "node",
        "children": [
            {
                "id": "537359399c80a",
                "name": "Header",
                "index": 0,
                "type": "node",
                "children": [
                    {
                        "id": "537385ed7c799",
                        "name": "HeaderChild",
                        "index": 0,
                        "type": "node",
                        "shopwareField": ""
                    }
                ]
            },
            {
                "id": "537359399c8b7",
                "name": "customers",
                "index": 1,
                "type": "",
                "shopwareField": "",
                "children": [
                    {
                        "id": "53ea047e7dca5",
                        "name": "customer",
                        "index": 0,
                        "type": "iteration",
                        "adapter": "default",
                        "parentKey": "",
                        "shopwareField": "",
                        "children": [
                            {
                                "id": "53ea048def53f",
                                "type": "leaf",
                                "index": 0,
                                "name": "customernumber",
                                "shopwareField": "customerNumber"
                            },
                            {
                                "id": "53ea052c8f4c9",
                                "type": "leaf",
                                "index": 1,
                                "name": "email",
                                "shopwareField": "email"
                            },
                            {
                                "id": "53fb366466188",
                                "type": "leaf",
                                "index": 2,
                                "name": "encoder",
                                "shopwareField": "encoder",
                                "defaultValue": ""
                            },
                            {
                                "id": "540d9e8c6ab4f",
                                "type": "leaf",
                                "index": 3,
                                "name": "active",
                                "shopwareField": "active",
                                "defaultValue": 0
                            },
                            {
                                "id": "53ea054339f8e",
                                "type": "leaf",
                                "index": 4,
                                "name": "billing_company",
                                "shopwareField": "billingCompany",
                                "defaultValue": ""
                            },
                            {
                                "id": "53ea057725a7d",
                                "type": "leaf",
                                "index": 5,
                                "name": "billing_department",
                                "shopwareField": "billingDepartment",
                                "defaultValue": ""
                            },
                            {
                                "id": "53ea0595b1d31",
                                "type": "leaf",
                                "index": 6,
                                "name": "billing_salutation",
                                "shopwareField": "billingSalutation",
                                "defaultValue": ""
                            },
                            {
                                "id": "53ea05dba6a4d",
                                "type": "leaf",
                                "index": 7,
                                "name": "billing_firstname",
                                "shopwareField": "billingFirstname",
                                "defaultValue": ""
                            },
                            {
                                "id": "53ea05de1204b",
                                "type": "leaf",
                                "index": 8,
                                "name": "billing_lastname",
                                "shopwareField": "billingLastname",
                                "defaultValue": ""
                            },
                            {
                                "id": "53ea05df9caf1",
                                "type": "leaf",
                                "index": 9,
                                "name": "billing_street",
                                "shopwareField": "billingStreet",
                                "defaultValue": ""
                            },
                            {
                                "id": "53ea05e271edd",
                                "type": "leaf",
                                "index": 10,
                                "name": "billing_zipcode",
                                "shopwareField": "billingZipcode",
                                "defaultValue": ""
                            },
                            {
                                "id": "53ea05e417656",
                                "type": "leaf",
                                "index": 11,
                                "name": "billing_city",
                                "shopwareField": "billingCity",
                                "defaultValue": ""
                            },
                            {
                                "id": "53ea0652597f1",
                                "type": "leaf",
                                "index": 12,
                                "name": "billing_countryID",
                                "shopwareField": "billingCountryID",
                                "defaultValue": ""
                            },
                            {
                                "id": "53ea118664a90",
                                "type": "leaf",
                                "index": 13,
                                "name": "customergroup",
                                "shopwareField": "customergroup",
                                "defaultValue": ""
                            },
                            {
                                "id": "5981b6e957401",
                                "type": "leaf",
                                "index": 14,
                                "name": "unhashedPassword",
                                "defaultValue": "",
                                "shopwareField": "unhashedPassword"
                            }
                        ]
                    }
                ]
            }
        ]
    }
}
It does not include all of your fields.