I really don't think that a different mainboard will solve the registering problem . . .
THAT can only be solved by building that "Service Key Adaptor Cable" and try with a barcode
scanner. The problem (apart from not knowing WHAT scanner was used) is that it was
obviously a 9-pin D-sub Type - now long gone . . . . I guess replaced by the later USB type?
I would like to think that, if you made the usb connections available - as "wires" - that when
you touch the "correct two" to the appropriate pins in the adaptor - then BANG! - the Ser.
Number would go in!
I have ONE final line of enquiry to try . . . . . . I'll let you know if it results in anything useful
N.B. - here is a 9-pin D-sub scanner . . . .
might work?
https://www.aliexpress.com/item/1005003 ... xsIGEoadnM
Chris