i had 4.4.2, so i downgraded, then rooted, then installed dualrecovery, then using CWM i flashed [Nut]'s .681 FTF and saw i got superSU and stuff, checked for root and i seem to have root. phone seems to be working fine.
Q1: What is the stripped FTF for? i flashed the corresponding stripped FTF later, also from [Nut], but it kinda broke things, and i started to experience strange things like vibration&sound gone, gyroscope not working, etc. so i flashed [Nut]'s .681 back but without the stripped FTF - works fine this way and i got root. In my research i found that the stripped FTF supposedly only contains a kernel. is that true? what is different in that kernel? do i need it or can i keep the kernel that comes with the .681 ROM?
Q2: Today i found out a new version came out the .757. i purchased Titanium backup, and made backups of my third party apps and data. i also made a TWRP backup, and i am considering flashing the new .757 ROM. But i would like to know if there is a way to save my email settings, i mean not the emails or sms itself, don't care about that, but the email accounts and its settings like pop, smtp, email, exchange email, etc
because everytime i flash a new rom on my z1, i need to setup like 6 email accounts and its getting annoying. so Q2 is: is there a good way to backup those?
Q3: do i need a stripped .757 ftf?
Q4: for third party apps to have write access to my sd card, i had to install a fix for the permission.xml in .681 because google supposedly changed the required permissions, do i have to fix it in .757 too? if yes, can i use the same installer? afaik it's just adding a few lines in permission.xml, then setting the proper owner(root root) and attributes (644 was it?), so theoretically if all that installer does is replace that one file it should work right?
Q5: i purchased setCPU Pro to find out it can't set the governor and frequencies on the other cores, just on the first one. so i tried a few others and use "Multicore CPU Control Free" now, it says the free version only lets me set stuff on the first core, but it seems like i can also set the other cores and also the settings seem to work. so i am kinda satisfied, but is there a better one?
Thanks for reading and answering in advance! i am quite new to this rooting and unlocking and flashing thing....: