Sony A57 ISO intervals?

[Guest]

Just wanted to ask for help from the community.  I have an A57 and two A6300's and one of the things I love about the A6300s is the ISO intervals (i.e. 400, 500, 640 etc.).  The A57 on the other hand jumps from 400 to 800 with no stops in between.  Is there a firmware hack or anything out there to solve this problem?  Thanks! 

[michelb]

A57 being more of an entry level body only offers ISO steps in 1 stop increments ( 100, 200, 400, 800, 1600 etc)