FIXED!!!I was thinking...how could a new flash solve the problem if the firmware is correctly written into the flash? (verified with esptool.py)
Maybe there is something AFTER the firmware? Maybe the "erasing_flash" command doesn't work???
So i flashed a 512k BLANK bin into the esp and THEN flashed the nodemcu and....booom! WORKED!
So, before replace the flash...
1) flash
https://raw.githubusercontent.com/funsh ... nk512k.bin2) reboot
3) flash your favourite firmware
Many thanks to @cal for poiting me in the right direction!