Problems Programming EPM7032LI-44

Hi

I have some EPM7032LI44 ic's that I need to reprogramme.

When I try and program them as the correct type it fails but when I program them as EPM7032SLI44, they work OK. The programming software even says some devices are misidentified as LI when they are actually SLI's internally.

I bought a new EPM7032SLI44-7 chip thinking this would program OK but it fails even though it programs OK.

Does anybody about this problem, the batch codes are BFD*****.

Thanks

Steve