What kind of firmware needs this R4 clone?

Hi there,I am helping someone with updating is R4. Now I can see that this is a clone R4. It is has the same R4 typeface, but with an 'i' added. The original firmware was once downloaded of r4ultra.com. However that site is now long gone. It uses a version of AKAIO (version 1.8.6).
What kind of new firmware can be used to replace the current one?

A picture of your cart will help.