Downgrade 5.1.1 to 5.0.2 and other issues

Hi,

I have some problems with my Z1C, you guys might be able to help me !

I have a Z1C 5.1.1 rooted with this rom : http://ift.tt/1Xd5ci0 which was dirty flashed over this one http://ift.tt/1XHpDEg.

- Well first, my battery life has been divided by two with relatively the same usage, especially when I am 4G LTE. Is 5.1.1 known for this battery drain when using mobile data ?

- I have changed my password on an account, and I can't connect to my account using the phone app but I am when using my computer so it really comes from the phone. Weird thing is that, when I switch back to my old password I am able to connect to my account. I thought it came from the Google Smart Lock password stuff, but I deleted the account in question in my Google Account, I have tried to switch it off but no luck either. I have wiped cache, dalvik, boot/reboot, uninstall/install the app in question already so I am kind of stuck.

- Lastly, is it possible to downgrade easily from my current rom to the previous one cited above ? or maybe you can advise me a battery friendly 5.1.1 rom :)

Thanks in advance!


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