1allow update_engine custom_ab_block_device:blk_file rw_file_perms; 2allow update_engine modem_block_device:blk_file rw_file_perms; 3allow update_engine proc_bootconfig:file r_file_perms; 4is_flag_enabled(RELEASE_AVF_ENABLE_DEVICE_ASSIGNMENT, ` 5 allow update_engine dtbo_block_device:blk_file rw_file_perms; 6') 7