There are a few programs that do this job but none easier than ‘M0BMN’s’ WidebanderV4.

by Peter May, VK2IT, vk2it@tpg.com.au

This program uses undocumented CAT commands to read or update the EEPROM
in the Yaesu FT817, FT857, and FT897 Radios. The soft jumper settings are stored
in location 4 and 5 of the EEPROM. Power the radio off and on to activate
the new settings. If you do a reset of the radio, you will have to run
this program again to rewrite the values
The program assumes that the radio CAT rate is set to 38400 baud

by Peter May, VK2JCG, vk2jcg@yahoo.com.au

This program uses undocumented CAT commands to read or update the EEPROM
in the Yaesu FT817 and FT897 Radios. The soft jumper settings are stored
in location 4 and 5 of the EEPROM. Power the radio off and on to activate
the new settings. If you do a reset of the radio, you will have to run
this program again to rewrite the values