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Hi, i wanted to change firmware on may printer from stock Anet V2.0 firmware to Marlin. The problem is that every time i try to do this always i get the same error:

avrdude: stk500_paged_write(): (a) protocol error, expect=0x14, resp=0x21
avrdude: stk500_cmd(): programmer is out of sync
avrdude: stk500_cmd(): programmer is out of sync
avrdude: stk500_cmd(): programmer is out of sync

This last line apears away in infinity. Sometimes it shows this:

avrdude: stk500_recv(): programmer is not responding

I had been trying with Arduino IDE and Marlin-configurator on different versions of Marlin and i have no idea what is going on. I even tried on linux but only with Marlin-configurator, and there i was always getting access denied.
It can be important that i have written on my anet a6 motherboard: “ANET3D V1-5.”
I will appreciate any help from you.

My english may not be perfect so if u won’t understand or misunderstand something i will try to explain.

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Same problem here, tried with platformio and arduino IDE. Printer is connected to serial port but can’t communicate with programmer. I have anet v1.0 board definition installed in my IDE but doesn’t seem to work. Also an Anet A6 bought a month ago. Have you found a solution?