Just tried it. I got the same problem with video recording (not working...I made a clean install by wiping everything with twrp). Live display doesn't work (the Amber display color for the night). I tried to use google face detection but it crashes (just for fun).
Edit it seems a little bit...
I am using it but my mi2 is a secondary phone. Video recording not working and I cannot check data connection because of the problem with my imei. Huge drain in airplane mode (i don't think it is so important)
I tried this one and it seems pretty solid. I cannot try data and phone calling, cause my imei and baseband are gone. Also camera video recording doesn't work (at least to me). No other bugs so far
unfortunately in my case I cannot connect to internet (wifi and data don't work) and activate the miui latest rom...I also found another qcn specific for mi2 but i think i screwed something deeper in my phone
unfortunately the one @Porske passed to me is not for mi2 but for mi2s...check under your battery, there's a sign:
mi2 - 2012061
mi2s - 2013012
it should be the different chipset the problem with the restoring (it seems to work from qpst but when i reboot the phone there is no imei and...
diag driver: https://mega.nz/#!CZFTVJYS!lvBK0RlWKPIMHQjbeNrzBulcBqTtqBGqaBBiGv2gpyE
optional (if you don't have adb in your pc): https://www.androidfilehost.com/?fid=24591020540824933
as far as i remember it's not working with custom rom...try to enter diag mode, there are 2 ways:
1) dial pad: *#*#717717#*#*
2)terminal (cmd on windows):
setprop sys.usb.config diag,adb
Then you need to install some driver (qualcomm qpst diag driver) and finally you can use...