i extract hosd and some other files from a firmware.zip inside the appropriate OTA.zip ,but how can i use them for a keyfiles ? my phone is htc u ultra ,the OTA file is OTA_OCEAN_NOTE_DTWL_N70_SENSE80GP_HTCCN_CHS_2_1.18.1405.3-1.17.1405.1_R3_release_4980649m9f02fkwj5sdrxb.zip . is these files...