Is update 4.2 OK for iphone 3G? If not, which is best/highest update

My sister's 3GS died after she updated it to 4.3.x (I'm not sure which). When the battery got low, she plugged it in- and the screen never lit again. Anyone know what the heck happened?
Until that mystery is solved (or the new iphone comes out), I want to lend her my 3G, but I have not updated it since 4.0, since I was just using it as an iPod. What is the most recent update I can put on it? Will a restore even work from a 3GS backup to a 3G?
Thanks in advance for any help!

A restore will work, but one from the same iOS version or to a newer version. So if the 4.3.3 update took and the backup for the 3GS was done after the update, you will not be able to restore it to the 3G. You should be able to restore an older backup to the 3G though.
Many have complained though that iOS 4 causes their 3G to run slow. Since you are already on 4.x, I would say upgrade to the latest version which is 4.2.1 for the security updates.

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