i think you need to ahem it back...
so you want to install the 5.00.20 version..
i recommended you to install the 5.00.30 <<good
anyway.. AFAIK.. if u just uninstall the software[installer],[all other thing;map/poi/etc...is not removed].. it couldnt be a problem..
you just need to install the v 5.00.20/5.0030 software[dont need other thing.. just the .sis installer,no map,no other thing]
if u install and keep it in your ROM.. it will affected the phone memory...
your phone will be lagging..
i dont know about that such software... for me it useless.. better keep the software in memory card is better
Already install v5.00.20, and still got the same problem. its stuck on the main screen. require 8 character code.before this also i didnt connect to internet from the phone.