Hello ArT !
Problem resolved !
I begin with a short story:
When I have trouble with buffers, I order from China. In the mind time one friend send me from hes work 4 pcs (CU245A 79KG4 D7V1). I make one test with 1.8V chip and everything was fine. But with this buffers I have all the problems and this strange behaviors.
Anyway, I change the buffers with what I receive from China (BU245 67KG4 A15)
With this buffers I write the MX25L6473 8-WSON without problems.
Thank you again for your professional support and happy holidays !