PSA: for people who want to update and are getting error when trying to update the Ironhax payload to 10.3, I think I figured it out. Apparently the latest installer doesn't work if you're not running hax 2.5, which means you'll have to first update the hax to 2.5 for your current firmware with the old installer, then update to 10.3 with newest one from smea's starter kit.
Here's the old 2.5 installer:
http://1drv.ms/1kVFuz7 