thanks for the replies. it gives me some hope. that the downgrade can be done.

os 7.1.1

For the record,

the software installed ran the lc040 machine okay with the lc040 chip in it.

The software installed ran the 040 machine (q800) okay with the 040 chip in it.

The software installed is not running parts of some programs properly in the 040 machine with the lc040 chip in it. (bad f-line instruction)

Having said all that, i am going to check if the lc040 chip is still working properly in the lc040 machine. who knows, maybe i zapped it somehow in the transfer.