hello mikrotik
i have my old rb450 3.30 and before this router works stable without rebooting and i try to upgrade the license via update license key after upgrade and has a new license key i notice every 24 hours my router stop working, mikrotik is there any solution to back my old license key??? and please help 
thanks you very much
your old key was saved in /files
chupaka my big problem is i forgot to copy my old key and i deleted in files, oh my godness
Contact with your reseller/local distributor or MT support (support@mikrotik.com). They should have your old (7 chars long) and new (8 chars long) soft-ids.
yep, your license should be at your account on www.mikrotik.com
you may try to request it if it’s not there already
ok thanks chupaks