Research sources for low level forensics?

So I am working on a challenge last week and an image was taken from a Iphone SIM and using only hex editor we need to find unidentifiable information, location, phone number, carrier and some random information was removed and we need to identify what data is missing.


I attempted to research on google but it is almost all casual questions about recovering phone data.

I attempted stack overflow and reddit but neither seemed to have any information on the …

computerforensics forensics research