ESP32 download tool failes to upload binary

[Captain.Chode]

I have a small project written in platformio with the Arduino framework. I have exported the binary and try to upload it with the ESP flash downloader. The first upload succeeded (to a brand new devmodule), but for the second time (to the same module) failes with the following error:

is stub and send flash finish

I didn't set anything security related or whatsoever. What could be the problem?

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[Captain.Chode]

So apparently uploading these files solved the problem:

bootloader.bin @ 0x1000
boot_app0.bin @ 0xe000
partitions2.bin @ 0x8000

After that it is possible to upload just the firmware. Not sure why did it work in the first place though...

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