My s4 has an apr 93 octane tune. It's. 2001.5 car. I'm assuming it does not have a chip soldered in?
Open it and look
Can I reflash the ecu without any issues
If there is no riser, if nefmoto flasher doesn't work, you can always bootmode.
If you do not have a riser, recommend boot mode reading the current flash before doing anything else.
If you do have a riser, you will need another ECU or you'll need to replace the riser with a new flash (preferably blank or preprogrammed with stock).
Also can I use the me7 logger on the apr tune or will that cause me problems?
Yes.