I have followed instructions posted in a number of places but can't get into flash mode. I have been holding down Home button while I plug in USB (to PC running PhoenixSuit)) and then short presses on power key continuously to try to get into flash mode with no success. I think that there is a trick to it with timing on the power button presses. Has anyone any advice please. It is so frustrating because I would really like to upgrade firmware to help stop instability problems.