Here is solution for jailbreak iPhone.

Extract and install Garmin downloaded from here

- From Cydia, add the repository cydia.xsellize.com

- Download and install the package FIREWALL IP from the repository

- When you restart, perform firewalling

run FIREWALL IP

- Go GLOBAL DENY

- Press TAP TO ADD A HOSTNAME

- type in gold.garmin.com:80 and press OK

- At this point it may be possible to run the Garmin without problems