With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ceDiagEntityImageOperStatus
Cisco Entity Diagnostics Entity Image Operation Status
1.3.6.1.4.1.9.9.350.1.3.1.1.3
This object indicates the actual image the physical entity is running: 'operational' - the physical entity is running the operational image. 'fieldDiagnostic' - the physical entity is running the field diagnostic image. 'booting' - the physical entity is booting; that is, there is no way of determining what image the physical entity is running because it is currently booting.
Back to CISCO-ENTITY-DIAG-MIB MIB page.
IPHost Network monitor allows you to monitor ceDiagEntityImageOperStatus on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.