How to boot into Android Recovery in Samsung Galaxy Devices

First, you must know type of your device.

Turn off your phone, and turn it on again.

Pic 1 (Samsung Above GALAXY)

Pic 2 (Samsung Below GALAXY)

Look at Pic 1 and 2. 

If your Samsung above Galaxy like pic 1, it means your phone was Type 1.

If your Samsung below Galaxy like pic 2, it means your phone was Type 2. 

This is your key map:

For Type 1 user:

-Turn off your phone 

-Hold Power + v.up + center.

- If the SAMSUNG appear, release the power.

- If the Android logo appear, press the menu button once.

For Type 2 user:

- Turn off your phone

- Hold power + center

- If the SAMSUNG appear, release the power.

For Galaxy Tab:

- Turn off your tab

- Hold power + home

- If the SAMSUNG appear, release the power.

For Galaxy Tab 7+, 7.7, 8.9 and 10.1:

- Turn off your tab

- Hold Power + v. down
- If the SAMSUNG appear, release the power.

- Select Recovery Mode using v. down to highlight, and v. up to select.