csho88

I have downloaded and installed this version (5.1) on my 582. I found that the system ran very slowly and could sometimes waiting up to a couple minutes when switching from one app to another one. Is there any way I could revert back to the previous version? I have tried downloading the factory kitkat version into a micro SD card and put it into the 582 box and reboot. I then used the software update app and tried Local update to select the file from SD but I could not see the file at all. I tried this many times and still could not see the firmware file. Please suggest a solution. Thanks.