Unable to load programs onto Arduino Pro Mini Using FTDI? I'm pretty new to this, so forgive me if I get some things wrong. I am working with a piece of equipment that uses an Arduino Pro Mini. When I first got to it, I realized that some of the code was incorrect and wanted to fix it. Unfortunately, my Pro Mini is soldered into the board with the labels and pins down, so the only accessible pins are the top six, and even those aren't labeled. The reset button is also upside down. I tried using a FT232H FTDI 
hooked up (using a pinout because of the aforementioned no labels)

D0-> TX

D1-> RX

which I was told should work, but when I plug in the micro-usb into the FT232H and try to upload the sketch, it gives me the error

avrdude: stk500_getsync(): not in sync: resp=0x00


and also blinks green but has a constant red light (from what I can see from looking under the board). Because this Pro Mini controls my equipment, I'm wary of doing anything too intense. Any ideas of how to fix this without breaking my apparatus?

Update!
I changed the pinning, and the IDE told me that it uploaded, but it still won't run the program! Help!
Same problem faced. Try out many times with proper connection but no success. After that, I found one unique and simple solution. I use Arduino Uno instead of FTDI. Follow below step, your problem will definitely solve.


First, remove Arduino Uno's IC means ATMEGA 328P-PU.
Now, do connection as shown in below figure.




Connections are like:

Arduino Uno(Without Chip)     Arduino Mini Pro

          RX                         RX
          TX                         TX
          +5V                        Vcc
          GND                        GND
         RESET                  RST(RESET PIN)



Now, plug your Arduino Uno to your computer and open your Arduino IDE.
Now, an open sketch which one you want to upload. Now, go to Tools and select board in which you want to upload code. Below, show in the figure.





Now, upload your program. It will definitely work.


I hope it will help you.