Lost the Base Registration Key

Hi all,

 

 

When i upgraded the Big-IP LTM 3600 from TMOS 9.4 to TMOS 10.2. I forgot to backup /config/bigpipe.license.

 

 

Now, the base registration key is lost so i couldn't activate lisence. Please help me how to get the Base Key or Lisense file for activation.

 

 

Thank all.