Atmega328P burn bootloader with FTDI I need your help.

I am using Arduino ProMini in my project.

In project board there is Atmega328P which doesn't have Arduino bootloader, and Atmega328P RXD, TXD pins are connected to FTDI Basic(sparkfun)'s TXD and RXD pins. 
I searched on internet how to burn bootloader for arduino. Most of them use other Arduino's built in SPI or other method. Problem is Atmega328P is already assembled to PCB board and I cannot make any soldering or change. Atmega328 and FTDI basic are connected and assembled to upload sketch (if there is bootloader of Arduino inside of Atmega328P, no problem to upload sketch).

Is there any solution or suggestions to burn bootloader using FTDI?

Thank You.
You cannot upload the bootloader through the ATmega's UART pins.  

Perhaps the the necessary pins (SPI &amp; reset) are broken out on your board, and if not you may be able to tap them with some fine hookup wire long enough for the task as long as there are no conflicting peripherals connected to them which you cannot temporarily disable.

Otherwise you may just have to desolder the chip. 

A typical FTDI serial adapter is not the right tool for loading a bootloader either - it might at a stretch be adapted to very slowly toggling the ISP pins but the usual choices, such as an ISP programmer or another arduino with an ISP sketch on it will require far less effort on your part.