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It's supposed that you have to change the three first lines of the file:
LIST P=18F452 ; change also: Configure->SelectDevice from Mplab
xtal EQU 4000000 ; you may want to change: ...

I can't believe nobody use tiny bootloader.

In this case, do you use any other bootloader for PIC18F452?

With only a single switch you need to do a sequence. Once you power-up the pic, the program have to wait until the switch is turned on, then the password can be like this:

2 seconds on-1 second off ...

I use Tiny for programming the PIC18F452 and it works when I use a crystal of 4 Mhz, but I've tried with a 10 Mhz crystal and it doesn't work. Shocked

I've changed the xtal line, in the bootloader ...

I want to communicate a PIC with a cellphone or another PIC through bluetooth, and i'd like to know what is the easy way to do it.

If it's possible i'd prefer not to deal with the bluetooth protoco ...