New to Arduino. Read everything I could find because neither Nano would accept e.g. the Blink program.
Eventually one of them (that I unsoldered from another commercial project and has a warped PCB) eventually worked by selecting the "Atmega328(Old bootloader)"
But the other one, straight out of the packaging, gives below error message.
Using Port : COM3
Using Programmer : arduino
Overriding Baud Rate : 115200
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xfb
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0xfb
avrdude: stk500_recv(): programmer is not responding
What I tried: 328 processor (both presentr and old bootloader)
Install the driver for the CH340 chip: it already had the correct driver.
Since I've been programming (or better 'trying') Arduino's for a few hours now, I guess telling you that there is nothing else attached to it, sounds superfluous.
I did not set the Programmer at first (it was at AVRISP mkII) and later changed it to Arduino ISP because that was mentioned in some threads, but it made no difference.
All LED's are red, it's a Chinese clone that I had in my inventory for almost 5 years, wrapped in an antistatic bag that I opened today.
The ON led is on, the L-led blinks, but ON time is 1/10th of a second and the OFF time is about a second (I counted 10 blinks in 13 seconds) so I am not convinced this is the preloaded Blink program.
When plugging it in, it blinks 3 times faster, then 5 times fast but slower than the first 3 blinks and after this it goes to the one-short-blink-per-second routine.
I've tried more, but with each thing I found, I assumed it would be solved, so I didn't keep track of everything I did... So your advice may meet a 'been there, done that' but in nicer wording 
I'd like to use the new Nano for a project (gift with some Escape room features to open it). If needed I could use the old one, but the warped PCB doesn't give me a lot of confidence that it will work when it matters most...