Guide on how to enter into recovery on android powered Samsung phones

There's a lot of guide scattered on the net on how to enter into recovery but most often it's incorrect because it really depends on Samsung models and their variant sometimes. So I compiled some or if not all of the known guides and here they are:

1. This is the most common and works on most Samsung android phones. With the phone turn off: Press vol up (+), the home (middle key) then power it on, release the power key after 5 seconds but keep pressing the volume down plus the middle key until the phone enters to recovery.

2. If the above instruction doesn't work, here's another one, this works especially on Samsung i9001 (galaxy plus), GT-5830i (ace), GT-5660v (gio) and some other models and their variants according to my experience; With the phone turn off: Press home button (middle key) then power it on, release the power key after 5 seconds but keep pressing the home button (middle key) until the phone enters to recovery.

3. Here's another trick if the 2 instructions above fails. I mostly encounter this on i9001  (galaxy plus) but maybe it could work on other models too. With the phone turn off: Press the vol up (+) then power it on, release the power key after 5 seconds but keep pressing the vol up key until it enters recovery.

Tip:
I often encounter on Samsung i9001 (plus) that it would enter recovery by doing the instruction 2 or 3 above but it would get stuck on the android logo. So you have to tap the menu key on the bottom left of the phone then press the power key again to kick it into recovery or else if you fail to do so the phone will gonna restart and you have to do the whole process again.

Using a small but powerful program called ADB shell

4. If all of the above instruction fails, there's still hope yet, this is on windows OS. But this instruction requires a little bit of knowledge on DOS command. Download below the adb program.
ADB shell
 For Samsung drivers just install kies which can be found on Samsung's website or if you are too lazy to install the program or you got a slow internet connection you can get the latest Samsung drivers HERE.

• First make a new folder on drive C (the root directory of your computer) and rename it ADB, then download and extract the files above on that folder or if you extracted it somewhere else just copy and paste it inside the folder. Make sure that the files is in ADB folder not on another sub-folder inside  ADB.
• Your phone should have the usb debugging enabled or else adb will fail reading your phone, so you should turn it on first if it's off, it's under settings>applications>development>usb debugging. Now using micro usb plug in your phone to the computer and wait for the drivers to finish installing.
• If you are using xp click start>run and type cmd press enter. If you are on vista or win7 click start then on search box  type cmd if it appears on search result right click on it then select run as administrator.
• A dos-prompt would pop up. Run this commands:

 cd \
cd adb
adb reboot recovery

• Now your phone will reboot and will enter to recovery.

There you have it, my compiled guides of entering into recovery on Samsung powered by android smartphones.