that is also the error i got. I think you did not get the entire memory wiped…
the wipe_all.bat looks like this:
esptool.py --port COM29 -b 115200 writeflash 0x000000 blank_1MB.bin 0x100000 blank_1MB.bin 0x200000 blank_1MB.bin 0x300000 blank_1MB.bin
You should see some sort of output i the command prompt. It takes about 1 minute or so to wipe the memory
all the above is in one line, can’t remember if I did, but think you should right click on the file and select “run as administrator”
PS: i use ardunio IDE version 1.8.6