Default [Q] root for my device

hello all,

can anyone help me to root my device as the built in memeory was 16gb and only 1gb available for apps.
below are the details for my device

model number : quickfone z5
android : 4.2.1
baseband version :, 2013/07/09 20:21
kernel version : 3.4.5 root @ android #1 mon sep 2 20:05:40 cst 2013
build number quickfone_z5_06v20_hd_20130902

thanks so much