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https://www.steelsoldiers.com/threads/manuals-for-the-mep-806b.173099/
https://www.steelsoldiers.com/threads/mep-805b-and-mep-806b-cim-info.161389/
There are a couple of links to the TM's. I believe the second one may be redundant, but included it anyway.
Looks like it's stuck in POST. So basically it does it's "power on self test", then looks for bootable media. It doesn't find any, so reboots to try again. This is the boot loop you're seeing. My advice is to go check the TM's and troubleshoot the bootable media. I believe there is a CIM...