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By schufti
#67580 maybe you just forgot to set your correct board type?
you can allways set it in programming mode by:

press and hold flash button
press and release reset button
release flash button

you can do this if you see in the status window that the flasher has problems
Image
in general all gpios should be safe to use as long as you satisfy the necessary level at reset time for the gpios allready mentioned by martinayotte (0,2,15).
gpio9,10 are not to be used also as they are used by the flash chip (allthough there are hw mods to use them).
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By Sky99
#67637
martinayotte wrote:http://www.esp8266.com/wiki/doku.php?id=esp8266_gpio_pin_allocations

In brief : GPIO15 need to be pulled-down, while GPIO2/GPIO0 need to be pulled-up for normal operation (GPIO0 grounded for upload)

Sorry i didn't see your message previously!
Thanks, that's the kind of things i was looking for :)