how do I replace a kernel module in linux?

I need to change a keel module, so I need to delete old module and replace with one which I have built.

Eg: I need to remove this /modules/fpga-module.ko and I need to add my improved version of /modules/fpga-module.ko into keel. Please help how can I do that?

rm /modules/fpga-module.ko
cp /my_repo/fpga-module.ko /modules/fpga-module.ko
insmod /modules/fpga-module.ko or modprobe /modules/fpga-module.ko 

lead me to errors.

Please help.