DMPs can be reimaged (upgrade/downgrade) to any firmware version from any firmware version. So you can downgrade your DMP from 5.2 to 5.1.
Log in the 5.2 DMP using https:// (Note you will have to use HTTPS to log in the Web GUI for 5.2 ) and navigate to the "Upgrade Firmware" section. Browse the relevant 5.1 DMP fwimg firmware from your PC -->Submit --> DO NOT close the Web browser while the upgrade/downgrade is in progress.
I would also encourage you to checkout the new release of DMS solution - 5.2 - which has considerable bug fixes and new features as compared to 5.1
I got a issue trying to register a DMP 4400 to a DMM 5.1, the DMM see the DMPbut just for a while, and after a few seconds the dmp dissapear, and it show the red sign. The DMM never show how many storage the dmp has. I had this issue before, and I know the DMM has to see the internal storage to the DMP works.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.