Cannot get AT Mode for Bluetooth Module

Hi everyone! hope someone can help me

The problem:
I'd like to change the name and (most importantly) the pairing code for my bluetooth module.
i'm using the HC-05 module (the one with JY-MCU) with my Arduino UNO - without the atemga- , but i haven't been able to make it enter the AT Mode,
i had followed instructions from blogs and stuff, but no success so far...

What i've tried:
i've tried connecting the key pin to HIGH before connecting power to the module itself as showed in http://www.instructables.com/id/Modify-The-HC-05-Bluetooth-Module-Defaults-Using-A/?ALLSTEPS
but didn't work. =(

i've noticed that if you change the key pin from gnd to vcc when the module is linked to the PC, it loses connection and then i have problems to open to serial port again.

about connections...
Arduino's Rx is connected to module's Tx, and arduino's Tx is connected to module's Rx
i've tried connecting the module to 5v and to 3.3v and doesn't seem to be a difference

i've read it is supposed to blink every 2 seconds, but mine keeps blinking as if looking for some device to connect with, doesn't matter if key pin is connected to gnd or vcc.

so...
is my module damaged?
is there a connection i'm missing?
Do i need a certain code in arduino's atmega?

as an extra i'd like to ask if there's a way to "block" the Rx pin, because i only want to send info, if someone was to link with the module (by guessing the pairing code or something like that) i dont want my module to "listen" to anything they could send to it and mess up the information being sent.

Thank you so much in advance !

any help is well appreciated ! :blush: