Trying to upgrade firewall 3110 but giving Error: invalid image type

[pranay awate]

rommon 8 > tftpdnld
ADDRESS: 192.168.10.5
NETMASK: 255.255.255.0
GATEWAY: 192.168.10.12
SERVER: 192.168.10.12
IMAGE: cisco-asa-fp3k.9.18.3.55.SPA
VERBOSITY: Progress
RETRY: 40
PKTTIMEOUT: 7200
BLKSIZE: 1460
CHECKSUM: Yes
PORT: GbE/1
PHYMODE: Auto Detect
.========================================md5 raw data: 2a ac d2 70 e7 de 5e 9f eb bc 57 5b 93 f5 74 e9

[image size] 738775104
[MD5 signature] 2aacd270e7de5e9febbc575b93f574e9
Error: invalid image type

[ahollifield]

Your question would probably be best answered here: https://community.cisco.com/t5/network-security/bd-p/discussions-network-security