@dohertyctl @bexcran @governetes Per our friend William Lee of ASRock Rack Technical Support: If you found the I/O shield getting too close to the rear UID LED Button, is there any lack in spacing at the motherboard mountings inside the chassis where it allows you to slightly adjust the motherboard’s positioning? The scew holes on the motherboard are designed to be a little wider than the mounting standoff to provide about 2mm-3mm marginal space to position the MB against the I/O shield. But yes, if the UID button is somehow in depressed position during the initial AC power on, it could put the BMC controller is “reset” condition or even corrupt the BMC firmware.
Since now that you have temporarily remove the I/O shield to free the UID button, did the BMC boot up or can you access the IPMI webUI? Also, since last night, we have just released a production BMC fimware 3.06.00 on the product page https://www.asrockrack.com/general/productdetail.asp?Model=ALTRAD8UD-1L2T#Download
Is this guide I wrote helpful? Rebecca flagged things for me that you should do to make it boot faster: Arm developer build guide for Ampere Altra