Ap3g1-k9w7-tar.153-3.jf15.tar !!link!! Now

I don't have enough context to identify "ap3g1-k9w7-tar.153-3.jf15.tar" (filename). I'll assume you want a file review for safety, contents, and authenticity. I'll proceed with a checklist and steps you can follow to inspect it locally:

Once the AP reboots, you can access it via the default IP (often 10.0.0.1 or via DHCP) and configure your SSIDs through the web GUI or the classic Cisco CLI. Aironet 3502i WAPs need switched to standalone ap3g1-k9w7-tar.153-3.jf15.tar

Abstract

Wait 5–10 minutes. Do not power cycle. I don't have enough context to identify "ap3g1-k9w7-tar