Thank you.

Well, it works but the Navman itself is not usable as it shows that the product key is invalid and the product key should be restored by MioMore Desktop. In turn MioMore can connect but it wants to type the key on device so no chance to go further...
This is the same with both Original and Unlock Backup.

What is also interesting is that in both cases device.xml file is changed to:

<device> <kernel><version>1506301905</version></kernel><bootloader><version>47</version><checksum>0</checksum></bootloader><hardware><type>￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿N502</type><displayname>￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿N502</displayname><version>788</version><id>31303030303030303030363465613561</id><base>Jangmi</base></hardware><application><firstuse /></application><sku><projectcode>N502</projectcode><skuid>0</skuid></sku><region><lcid>1033</lcid><version>1</version></region><processor><type>ARM</type><level>ARM version 4</level><revision>00000003</revision></processor><os><version>00050000</version></os><memory><size>0x7000000</size></memory><storage><size>0xf0000000</size></storage></device>

Any advice how to unlock/fix Navman?