I recently purchased a DIYMORE clone Arduino UNO (replacing genuine one I blew up) It has ATMEL M328P chip and WKH CH340 USB chip Using Windows 10
I could not get this to work Errors about not in Syn and Programmer not responding. Loop test failed. Ensured correct board and COM selected. Tried different PC. No go
I reinstalled CH340 driver (though my Mega 2560 with same chip worked OK) I reinstalled IDE Nothing would allow upload
Then I saw YouTube suggestion to try different board names in IDE
Found that board works (at least with simple 'Blink' test - haven't tried more complicated developed sketch) by selecting in IDE Pro or Pro Mini. Also works by selecting Lilypad Arduino (although stops with error in upload but after a second successfully uploads. If all I have to do is remember to select Pro or Pro Mini and it works, I don't care
This might be helpful info for others with clone problems
How can this happen? Has the wrongly named bootloader been loaded to M328P chip. Can I re-burn to correct it (though why bother)?