These are the steps that i did against the Zeroshell from earasing the file after next reboot.
1. I modified the script “3Gconnect” as you suggested (change string from “OK” “ATD$DIAL” to: “ERROR” “ATD$DIAL” ). and i copied it to /Database/preboot (i havet to create “preboot” directory first).
2. Then i put the command “cp /Database/preboot/3Gconnect /root/kerbynet.cgi/scripts/3Gconnect -a” into a preboot script area.
At Some area, My sierra modem can connect the internet at the speed almost 3.5 mb/s
Now I’m living in Thailand.