You can use the very old Bung Device that uses the parallel/ LPT /printer port. Named Pocket Linker or NGP Xchanger
If you have someone with that older Flashmasta flasher that might work too. I think the device is called Link Masta (very rare)
I own a pocket linker but i dont know if i can find Software or a PC with printer port.
I builded myself the Cart reader from Sanni but i dont have an adaptor for the NGP Slot so the device is able to dump but i cant connect carts.