820-01521: Not powering up

Have this unit that isn't powering up. Found the cause to be audio/ IO board on the left of the palmrest. The board and the cable were corroded. Once i replaced this, both usb-c ports are now going to 20v but never powers up. Trying using the T2 bridge restore but keep getting this message/error (see picture). Has anyone see this before.
 

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