Having problems updating and installing some apps and get the installation error, unknown -18 reason code too and just wanted to say thanks Geeks for having this information available for me!!!
It worked! The first method worked on my HTC Incredible:
Quote:
Originally Posted by tool2269
try this.. menu>settings>sd and phone settings>unmount the card..
then try to d'l a app from the market and see if it installs.
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Thanks again!!