Root Thread stuck in boot loop?

[thebillington]

I was attempting to install an MIUI XJ CM update, but my phone froze on the update screen in ClockworkMod for about 20 minutes, so I pressed the power button and it told me signature verification had failed.

So I went into ClockworkMod and turned off signature verification and then installed the update manually. Upon re-booting the phone the boot screen stuck on a loop.

Luckily I took a nandroid backup a few days ago so haven't really lost anything important and just restored to a working state, but I'm wondering what the problem was?

The update was '1.7.2 EN-ZH Update 2'.

Thanks