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By rudy
#77249 The setup looks OK to me. And yes connecting gnd of the serial converter is correct.

How about try: Erase all flash contents
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By jankop
#77265 The setup looks OK for esp8266-01, but not for esp8266-12. This has 4 MB flash memory. I don't know what is your module.
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By rudy
#77271 I have programmed 4M parts with a setting of 512K without problem. While not a good setting if you need more space but it is a safe lowest common denominator when you are not sure of what you have.
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By schufti
#77273 the problematic setting wouldn't be the low size BUT the QIO. There are ESP-12 with flash that accepts DIO only, especially on NodeMCUs. One wouldn't get an error during flashing, it just won't start ...