How to flash HTC Desire or Fix Boot Loop.
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Check here for firmwares:
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Read post #7 for Why the MTK 6589 USB Vcom port disapear after 2 second ?
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The connecting and disconnecting is normal for MTK devices in Device Manager. You don't have to panic. All you need is to be very fast when you see in your computer - Device Manager - MTK Preloader - click with right button - properties - driver - update driver - choose from specific location - next - browse for the file and then install the driver from the directory where you have put it. You have to see Windows Message that your driver is not digitally signed and press Continue.
Don't pay attention that MTK is connecting and disconnecting. When you install the driver it must be shown up(and of course disappear in 2 seconds) in LPT ports - MTEK VCOM Port or something like that. You are ready.
If you have installed a bunch of different drivers use the program USBdeview (goolge it)and unistall all MTK Preload drivers you have already installed.
Then you are ready to flash backup files with SP Flash Tool.
