I was upgrading my 5520 ASA to the latest security patch for 8.2 via Solarwinds TFTP Server. Every time I upload the IOS, it will time out and cancel the process.
As an alternative to the “copy tftp: flash:” command, I used the following wich worked like a charm:
copy FTP: Disk0:
Lesson Learnt:: whenever upgrading IOS and has issue with TFTP… use FTP: instead.