Are the following Avanti firmwares compatible with all versions of Telrad phone systems or is there a minimum system software/card chip set level that is needed? Also, can the old Avanti firmware below be upgraded directly to the new firmware listed below via the eManager software download program?

NEW AVANTI FIRMWARE OLD AVANTI FIRMWARE
sw_st30_0d_d2.hex <-------> 00_C5; 00_CF; 00_CD;00_C0; 00_B1
sw_st30-r2_50_d3.hex <-------> unknown