I have a cloned Nano board which is working (I bought it with code already on it and have been using it for a while. I now want to change the code.)
It has a ATMEL mega328P chip. I am connected via a FTDI232 USB interface.
I have the same problem on my mac (OSX 10.15.3 + Arduino IDE 1.8.12) and also on my Windows laptop (Windows 10 + Adruino IDE 1.8.12), although slighty different error codes.
In Windows, the IDE sees the board on COM3, but shows "unknown board" in get board info.
On Mac, the IDE sees the board on \dev\usb-00000000 (which seems strange)
I have checked the settings in IDE for board, processer, port, and programmer. I've updated the FTDI drivers as well.
When I try to upload anything I get the error:
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x2b
Any help would be appreciated!