I would like to know how to check if the motherboard in a Samsung devi

I would like to know how to check if the motherboard in a Samsung device is empty, i.e., has a blank IMEI.
What do I need to repair it, just like at an authorized Samsung service center, with blank IMEI software, firmware boxes, tools, and what else?

I would like to know how to fix a Samsung motherboard with a blank IMEI.
What do I need to repair it, just like at an authorized Samsung service center? Blank IMEI software, firmware box tool, and what else, because I purchased an m31s m317f motherboard with a blank IMEI from rounded.com.