Dude...LOL! did u flash MIUI two times?
The first flash u get stuck in boot loop u need to pull batery, 3 finger into CWM and fash MIUI again and boot and it will boot. LOL!
Can u please in a detailed manner explain what the problem is you are facing and how you got there. Explain in detail and u may not even have to go to stock. And ive gone to stock like 4 times so ive bricked the thing to a point where it needed to be JTAGGed otherwise meaning it had no boot image or recovery image and no download mode. ! lol so yeah no matter what infuse is immortal
ALso the prereq's for gettign miui is:
(assuming u are in total stock)
1. root
2. get modded 3e recovery
3. get CWM
4. flash Community v8 kernel
5. reboot into recovery and wipe data/factory reset
6. wipe cache partition
7. wipe dalvik cache
8. flash miui
9. reboot recovery
10. u will see blue cwm...flash miui once again
11. reboot system now!