...

1.
a)power-off
b)reset set
c)power-on
d)power-off
e)reset off
f)power on
=> not erase

2.
a)power-off
b)reset set
c)power-on
d)reset off
=> not erase

3.
a)power-off
b)reset set
c)power-on
d)new code write
e)reset off
=> noting change

[...]

P L E A S E H E L P

i say to all you thanks
for the help ....