Lots of fixes for power supplies dying, and some other things as well.https://www.sparkfun.com/news/2069
We’re now shipping the IOIO-OTG board loaded with the V4.02 bootloader and the V5.06 application firmware. New application firmware is frequently released, and can be upgraded without needing a programmer using the IOIODude application. Additionally, this version of the IOIO-OTG has corrected the IC power failure issue due to the on-board switch voltage regulator failing as well as adding a missing decoupling cap on the AVIN pin. This new IOIO-OTG has fixed the problems that plagued the previous version making it a true vision of how the board is intended!