you can try looking at the CISCO-FLASH-MIB if supported or the following CISCO-STACK-MIB objects:
Object tftpAction
OID 1.3.6.1.4.1.9.5.1.5.4
Type INTEGER
Permission read-write
Status current
Values 1 : other
2 : downloadConfig
3 : uploadConfig
4 : downloadSw
5 : uploadSw
6 : downloadFw
7 : uploadFw