One thought that comes to mind. Are the firmware files still inside the FW0002 folder? Unlike older machines, the folder is placed on the root of the drive, not just the firmware files.
I'm going to assume the following doesn't apply to your issue because you aren't seeing any messages on the screen, but maybe check these couple things that are noted in the service manual just in case.▪ When [Administrator Settings] -> [Security Settings] -> [USB Connection Permission setting] -> [External Memory (Service)] -> [FW Update] is set to "Restrict", a message "It is limited by the administrator." will appear, and update of the firmware cannot be executed.
▪ When [Administrator Settings] -> [Security Settings] -> [FW Update (USB) Perm. Sett.] is set to "Password Priority", it requires to input a password after confirming with the administrator.
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