Flashing Success...
Although my attempts to flash it directly in the Mac failed, the Geforce 5200 was successfully flashed using the time honored method of simply using a PC to do the work. It seemed to take forever to get everything just right on the PC being used for flashing but once started it worked the first try.
My last attempt at flashing (aside from the Radeon 7000s I flashed back a couple of years ago) failed. Mind you, I don't think many people have had success with a 'ole Geforce 4 MX440. I didn't really expect that one to work and it didn't. Nevertheless, now that I've got my feet wet again I think I'm going to try some others.
In other news, I gave my B&W G3 a good dusting out. It took me several minutes in order to get every little spot, but it looked quite a bit cleaner afterwards.

any hope you might be able to flash the MX back?
Back to the PC-rom? Yea, it is a simple enough procedure. I just have to get up off of my ass. I should have done it while I was flashing the Geforce 5200.
yah! I can supply a PCI GPU card if necessary.