Thanks to @guilhermehnog:
I’ve been able to unbrick, what i did was:
"1 - Conect to Serial
2 - type 4 to enter command prompt
3 - type this commands:
setenv flag_try_sys1_failed=0 (check if flag name is correct with printenv)
setenv flag_try_sys2_failed=0 (check if flag name is correct with printenv)
setenv flag_last_success=0
saveenv
4 - connect pendrive with original stock dev firmware renamed to miwifi.bin
5 - default brick recovery process: reboot pressing reset button until yellow led start flashing, then release reset button.
6 - wait completion
7 - Done.
Thanks Hammer and Rising_sun for the help."
Works!!!!