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The issue is seen while upgrading from FSW GUI OR FGT GUI (Managed FSW) due to an incorrect header check, as a workaround use FortiSwitch CLI to upgrade the unit.
Note that the issue is seen only when upgrading from the factory image v7.2.4_build5166 to any GA version.
FortiSwitch 7.4.3 - Firmware
Serial Console to the FS-648F will report the following:
Firmware upgrade in progress (alternate)
Writing the disk......... inflate failed! (incorrect header check)
Writing the disk......... inflate failed! (incorrect header check) Done(-1).
Logs from the FS-648F-FPOE will report the following:
S648F # execute log display
135 logs found.
10 logs returned.
1: 2023-10-05 14:23:11 log_id=0103034306 type=event subtype=system pri=critical vd=root user="unknown" ui=smit action=loaded-image status=failure msg="User unknown loaded a wrong image from smit."
2: 2023-10-05 14:23:09 log_id=0103034301 type=event subtype=system pri=critical vd=root user="FortiLink" ui="httpsd" action=restore-image status=success msg="User FortiLink restored the image from httpsd (v7.2.4, build5166 -> v7.2.5, build5293)"
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