I was trying to fix my GPS issue and it appears I have screwed up big time. PLEASE HELP ME! I followed these steps and when I reinserted my SD Card, the phone says my SD card is blank. Please help me!!!!!! If you would like to speed up the GPS lock and connection time on the Galaxy SII... Try this... Settings > Location and security > ensure the the 3 boxes under My location are ticked. Now download and install, free from the Market, GPS Status. Remove the sim card from your phone and reboot it. Open GPS Status (preferably outdoors with a clear view of the sky) and select Menu > Tools > Manage A-GPS state > Reset Now select Menu > Tools > Manage A-GPS state > Download Now just leave it for as long as it takes to get a solid lock on at least 6 Sat's (preferably more... 9->11 would be good). This can take 20 min's or more but be patient, When you have achieved this then select GPS Status Menu > Settings > GPS & Sensors > Auto-download AGPS data > choose how often you would like the data to be updated (1 hour -> 3 days... I have mine set for 6 hours) > tick the 3 boxes (GPS required/Lock to GPS speed/Filter the GPS speed, if required) and choose your Sensor filtering. Now power off your phone and replace Sim card and reboot. N.B. Please ensure you have no Task Managers or anything that will close or interfere with this app. Once rebooted you should find an improvement in accuracy and speed of your GPS.