Flashing to VS01... VS02... Flashing back to Z0J--- Flashing to VS04 (It works fine for me this one 
)....
But is there no limitation in flashing ? Or come a time with no more flashing permitted ?....
Just a question, I don't know nothing about flash memory.....
Well, there is a limit for how many flashes the flashrom could handle. I’m not sure how many times it is, but do not overdo the flashing…
You should not worry about that problem.
The main interest of a Flash is to be erasable/writable thousands of times (between 10000 and 50000 times).
As far as I can remember my microelectronics course, the way a Flash is erased involves low voltages (board voltages), contrary to EPROM (for which programmation voltages could reach 12V at a time). The structure of the transistor is less “altered” in a Flash programmation process. In EEPROM, the principle of programmation involved Flotox transistors that would capture a charge between the grid and the bulk of the transistor (the programmation process was MUCH more hazardous as regards data integrity)
That should not be an issue, considering the life span of a CD burner.