I have chinese clone of arduino nano 328 with new bootloader (baud 115200). It works good on almost at all small sketchs, like sos LED blinking.
I have a problem during uploading the big sketch GRBL master for laser engraving machine size .HEX 83KB (about 95% of memory flash). It starts uploading, reaches about 80% and stops: programmer not responding.
I even tried change bootloader from new to old - unsuccessfully, my board accept only new bootloader.
Maybe someone solved such a problem?