at the end couldnt do it because i dont have https, but i got the https and then my signalling server couldnt connect, so i just delete the sw and the offline to push a little the update BUT, IT DIDNT WORK because some explorers dont update like that...
i had to add some lines to the index.html:
<meta http-equiv="Expires" content="0">
<meta http-equiv="Last-Modified" content="0">
<meta http-equiv="Cache-Control" content="no-cache, mustrevalidate">
<meta http-equiv="Pragma" content="no-cache">
i dont know if this was the reason of the update working, but, at least it worked for now.