CPU firmware is mainly saved in one of two file formats. There are Intel Hex format and Motorola S-record format
Sometimes it is need quickly convert files from one of this format to another.
If you use PC with Windows OS then you can use HexFormatConverter.
It is simple application that don't need installation. Its single function is convertation files from Intel Hex format to Motorola S-record format and vice versa.
It has very simple interface