I have tried several different combinations with iGO apk /data.zip/sys.txt.
1) iGO 188.8.131.527071 with the data.zip come with it works with any sys.txt.
2) iGO 184.108.40.2067071 with the data.zip come with 220.127.116.111894 does not work with any sys.txt
3) iGO 18.104.22.1681894 with the data.zip come with 22.214.171.1247071 does not work. The contacts shows up in favorite, but if I click on any contact, the phone does not response, if I click on the contact again, iGO quit.
4) iGO 126.96.36.1991894 with the data.zip come with it does not work. adding following lines in sys.txt will make the contacts show in favorite. When I click on any contact, iGO come back to favorite.
I will stay with iGO 188.8.131.527071 until anyone found a solution to this issue.
Newer version iGO_184.108.40.2065985-sys_v2.apk also works.