The thing is, with an iphone 3g, I would still like to get ios 4 apps on whited00r, which is impossible with it running on whited00r
When I use iFile to change the string to 4.2.1 as suggested, the some of the apps on apptimemachine don't work.
Apps like iBooks for 4.2.1 are a lot more advanced than their ios 3.1.3 versions, and I can't have both working sametime!

Also, is it possible to change the whited00r firmware to accept ios 4.2.1 and how?
