3) to exit the download mode (when not flashing anything to the device) is to either pull the battery or long press the power button (which simulates a battery pull). Anyways what I did was take the device to support center and they told that IC power chip needs to be changed and was charged abt 27$ or so.
How to Hard Reset Samsung Galaxy Tab Active3 Gtactive3 Sm T577 with Recovery mode. Now we are going with a method that performs a somewhat deeper cleaning and with which you can solve some operating problems. You can use this method if your Samsung Galaxy Tab Active3 Gtactive3 Sm T577 bricked or is unable to access the settings. Turn off the
Goal is to install the GSI without root / voiding the warranty. My company produces an app which is primarily used on Android on Galaxy Tab Active devices. It's expected Galaxy Tab Active3 will get Android 12 update in the next few months and we wanted to do some regression testing in advance of that.
Boot Samsung Galaxy Tab Active Pro into Download Mode / Odin Mode. Power off your Phone. Once the device is off. Press and hold the Volume Down and Power button together for a few seconds. You should see the Warning Screen with two options – Volume Up to Continue and Volume Down to Cancel and restart the phone.
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If you do that it will boot in the Samsung stock recovery. On Samsung devices after flashing a custom recovery with the device in Download mode (a.k.a. Odin mode) it must be booted in recovery once to overwrite the stock recovery.
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SAMSUNG Galaxy Tab Active2 WiFi Recovery Mode. Turn off the device by holding the Power key for a few seconds. After that start pressing Volume Up + Home + Power button for a a short while. Let go of all keys when Samsung Logo pops up. Well done! . 14 264 6 320 53 243 29 68 253

galaxy tab active 3 recovery mode