Since they can be erased by ultraviolet, can this be done and then be re-inserted into the computer and they will read the computer and re-program? The # of the one I got from Germany/Singapore was M27C256B -10F1 88801 1215L and the ones I got from China are M27C256B 10F1L 98006 V5 MYS 96 824. Do these ring a bell?
Those number mean nothing to a Guzzi. For example, the 88801 and 98006, are likely date codes. The 10, as in the 10F1, is likely the speed. I believe that means 100us, but those brain cells are long faded.
They are like buying a memory card for a camera. You get a memory card labeled 8G SDHC or such. You don't expect it to already have pictures on it, it is a blank card. So you are buying blank memory chips.
You can get UV erasable, or, you can get OTP. OTP is cheaper, but One Time Programable and not reprogrammable. The last batch I bought were OTP. They were cheap, less then $1 each I think. The UV erasable can be unreliable. Not enough UV, they don't erase. Too much UV, and they are damaged.
So take those blank chips and throw them away. Get a pre-programmed chip. Be done.
Figure out where to get a programmer. Borrow a programmed chip to read the contents or get a BIN file, and program the chip.
I have a stock EV bin file, so it is labeled. (again, old brain cells) If you have a programmer, you can tweak that map and burn the changes to a chip.