Yes, I’m checking with other Nano-old devices but all same symptom.
I’ve checked with mblock published device “Arduino Nano (old)” : Developers : Ablock
then uploading works well with my Nano-old devices.
So, I guess if I change the vendor id in “Connection Settings” , it will probably work.
This is why I asked @xuanngoc the vendor id of Nano-old.
And the test code I’m using is very short.
It’s only for upload test.