[EL7] How to update idrac without logging into idrac

I have an R710 running Enterprise Linux 7, and I need to update idrac.  But the reason I need to update it is that I can't log into it with any modern browser because of SSL limitations, and the old browsers I tried don't render it properly either.

I've tried a lot of things.  I've downloaded the suu ISO file thinking it was supposed to be able to update firmware without even using network connectivity, but that didn't work..

[root@server SUU]# ./suu -u

------------------------------------------------
Welcome to the DELL EMC OpenManageServer Update Utility.
Copyright (c) 2003 Dell Inc. All Rights Reserved.
SUU Version: 17 .10 .00 .209

[root@Installnode SUU]# ./suu -u

------------------------------------------------
Welcome to the DELL EMC OpenManageServer Update Utility.
Copyright (c) 2003 Dell Inc. All Rights Reserved.
SUU Version: 17 .10 .00 .209

------------------------------------------------
The Server Update Utility you are running is more than 120 days old, check for a newer version on http://support.dell.com
------------------------------------------------
System is compliant with prerequisites
Checking if update allowed
[Fatal Error] :-1:-1: Premature end of file.
The System Update Utility failed.
Premature end of file.
exiting SUU application ...
[root@server SUU]#

What is that?

I've had idracadm7 on my commandline even before that so I thought I'd try that too

I have a firmimg.d7 file that I'd like to install so I ran:

[root@server SUU]# /opt/dell/srvadmin/bin/idracadm7 fwupdate -p -u -d /var/lib/tftpboot/firmimg.d7
sh: bmcfwu.so: command not found
[root@server SUU]#

wtmfs is bmcfwu.so?  where can I get that?

Or is there a better way to update this without rebooting?