Migrated TrueNAS from older host to UEFI host, and cannot upload saved config ; also, boot pool issues?

[SmallBarky]

It would help if you posted hardware details on the previous system and OS version and the new one.
Screenshot from 25.10.1 showing Sys Config menu on right

Read the following, Now might be the time to switch before you have data loss.
Multiply your problems with SATA Port Multipliers and cheap SATA controllers

Multiply your problems with SATA Port Multipliers and cheap SATA controllers

This resource was originally created by user: jgreco on the TrueNAS Community Forums Archive. Please DM this account or comment in this thread to claim it. In the last year or two, we’ve had a resurgence of users asking about SATA Port Multipliers and cheap SATA controllers. Please, do NOT use port multipliers, and use cheap SATA controllers only after extensive research. SATA controllers and SATA Port Multipliers are some of the cheapest hardware, designed to make a number of hard drives acc…

What’s all the noise about HBA’s, and why can’t I use a RAID controller?

What's all the noise about HBA's, and why can't I use a RAID controller?