Symbol LDT 3805 (LDT3805CES206E)

• To boot into Recovery mode, you need to turn off the tablet, then hold down the Volume Down button and simultaneously press Power button.
• Keep both buttons pressed until you will see Android logo.
• After loading the recovery mode you need to select «wipe data / factory reset».
• The touch screen does not work in Recovery mode so you can navigate the menu using the volume control buttons and power button to confirm.
• Then you need to click on "Yes".

Restart your tablet. That's all. You have done a hard reset dragon touch tablet.

I am assuming you meant Motorolla MC3090 mobile comupter running Windows CE.

MC3000 User Guide - Motorola MC3090G Win CE 5 0 Core User Manual

On 28, 38 and 48-key keypad configurations, press the Power button to turn on the mobile computer. On 20-key
keypad configurations, simultaneously press the Fn and MENU buttons to turn on the mobile computer. If the
mobile computer does not power on, perform a cold boot. See Resetting the Mobile Computer on page 2-28.
When the mobile computer is powered on for the first time, it initializes. The Splash screen appears for a short
period of time, followed by the Calibration screen

Beginner guide to Android How to setup your phone or tablet

How to Reset Samsung Galaxy Tab to Factory Settings Galaxy Tab Forum FAQ...

When you long-press the power button on Android, this usually causes a forced shutdown.

A hard reset is when you reset your tablet to a state where there is nothing on the tablet except for the default apps and the operating system.

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Reset procedure to many electronic entertainment equipment are given.

Turn power off. Hold the power, home, and volume up butoon at the same time for 5 sec. Then release the power and home but keep the volume button held down until you see the android symbol appear then let go. Then you will have the option to hard factory reset your device.

Plug the supplied charger in to the TP and into the wall. Then hold the power button and the button at the bottom of the screen simultaneously. After about 10 - 15 seconds the TP reboots.

Hello
Do a reset to the set. Just unplug it from AC mains wall socket and replug it after 3 minutes or so; or just go to ints user manual to know, how to reset it to factory defaults, and do it. OK.

The SDK with C libraries is provided here http://support.symbol.com/support/search.do?cmd=displayKC&docType=kc&externalId=KB100126
its called "Series 3000 Application Developer Kit (v3.5)"

Turn off main power, press "direct" and "pure direct" simultaneously while turning main power on. The display starts blinking, reset is done.