One easy method is to make up a decimal look-up table for each hex digit. The MSN table will have 16 entries, from 0000 to 3840. (0x256 ..... 15x256)
Next digit table will have values from 0000 to 0240. The LSN able will have entries from 0000 to 0015. Isolate each nibble in turn, and lookup its decimal value. Add all the table results together (decimal adjusted), then add 30h to each nible to get ascii.