Hello!

I want to start studying the firmware of an 5110. I want to see if it's possible to add things in the firmware (such as a call timer displayed during the call - a feature that I miss the most in Nokia). Any information that you could provide is useful. I want to know if this is possible and then I need a disassembler, any info about the memorymap, in-out etc. Maybe someone that is working on something similar can write me. I'm interested mainly in 5110 v5.24 since this is the version of my phone.