I did manage to get things working using some careful rsync work from the good image.everyone have 8.2.3c1 and 8.2.3d (not d1), even google.
ps without full copy you can just check md5sum for all files on both partitions (except /var)
but *e* only available with Certificate Upgrade License (lite version of TruFos for 32G). If someone has one I will be glade to take a look at it
Yeah I ran across something saying you could get some version of 8.2.3d on there without the certificates but after that you were out of luck without support and the ability to get a certificate/entitlement. And 9.x doesn't run on these, only the Gen 6 and above I think.
Anyone reading in the future, take all of that with a grain of salt, hours of bleary searching vague/conflicting information.
But yeah, it would be great to have 8.2.3e2 somehow - I believe that's the newest available for Brocade Gen 5 switches. It does seem to exist: https://docs.broadcom.com/doc/FOS-823e-RN
Thank you for the reply!