Because the customize.json now looks as follows:

"214-001":{"wallpaper":"/resources/{940e20c0-8052-4b57-aba5-8249c1fba2d6}.json","default_contacts":"/resources/contacts_movistar.json","support_contacts":"/resources/support_contacts_movistar.json","network_type":"/resources/network_type_movistar.json","known_networks":"/resources/known_networks_movistar.json","nfc":"/resources/nfc_movistar.json","sms":"/resources/sms_movistar.json","ringtone":"/resources/{c875e51b-fb8f-489e-93af-bbc1a73b69c3}.json","power":"/resources/{eeb8544a-174d-41a7-aaa5-64f8b3347921}.json","keyboard_settings":"/resources/{3d1c5065-399d-418e-807a-1a4d57423b93}.json","data_ftu":true}

Now I need to modify keyboard, power, ringtone and wallpaper json in order to add the default values. So I generate the name in build time using a random uuid and is not possible to know what is the expected value. But, as default values are not going to change for different mcc / mnc, I think I can keep the original name for the json. I am going to change it.