I've looked online and no exact guide between these two boards are around but I tried matching mini pro->FT231x as follows:
GRN->CTS
TX0->TX
RX1->RX
VCC->VCC
GND->GND
BLK->DTR
but I get the problem:
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x99
for all 10 attemps.
What's wrong?
FT231 TX to Mini Pro's RX
FT231 RX to Mini Pro's TX
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still doesn't work, I also tried just straight up plug in by matching BLK to to BLK since VCC position is aligned, doesn't work either.
I have no clue why you are fixated on colors !
You should be concerned with pin functions !
I have two FTDI adapters purchased on eBay and they most definitely can program a Pro Mini.
So either you connections are wrong or your Com Port selection is wrong.
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what colors? I matched pin functions and didn't work. Are you sure FT231x should work, it's not listed on Arduino mini site as an option. I only have this laying around though... Also the type of error im getting it's connection with serial adapter right? (see first post). How do you know it must be connection or com port when it's not the same adapter?
It's operator error unless your board is broken.
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BLK->DTR
GRN->DTR will work if your other connections are correct.