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I want to install one application which is not in the Market. I know that if I want to do that I should switch on the "Unknown sources" option, but I don't have "Unknown sources" on my Dell Streak. What should I do to get this option?

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What version of Android are you running? Specific firmware version would be useful too. I assume you've looked for Unknown Sources in Settings -> Applications? – Matthew Read Apr 11 '11 at 16:06
What is your carrier? – Al E. Apr 12 '11 at 13:22

Depending on your firmware version, you might be able to abuse the ability turn-on engineering mode. Taken from StreakSmart:

  • Dial *#*#307#*#* on your Streak. Other than a quick flash on the screen, it will look like nothing has happened.
  • Go to your app drawer/program menu and tap a new icon labeled EMList. If the icon is not there, turn off the Streak. It should be there when you turn it on again.
  • Scroll to the bottom and tap app_security.
  • Tap update unknown resource property to enable it.

This will be the only way without installing a custom rom (Google StreakDroid)

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First you need to enable the option to install application through unknown sources, you can achieve this in

Settings >> Applications >> Unknown Sources

Then you can use ADB to install applications from your PC or use ASTRO File Manger to install applications in your SD card.

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