Živjo!
Sem začel coversation, kjer se lahko pogovarjava po slovensko, tukaj bom pa nadaljeval v angleščini, da bo še kdo drug imel kaj od tega. Za začetek:
First step:
If your phone is rooted install Partitions Backup from Google Play Store and use it to make backup of everything to SD. Transfer backup from SD to PC. Second app is Online Nandroid Backup, use this one too. There are never too many backups.
Basics:
To understand what you are doing here:
http://en.miui.com/thread-207290-1-1.html go here:
http://tektab.com/2015/10/31/android-bootloaderfastboot-mode-and-recovery-mode-explained/
and also
http://www.slideshare.net/chrissimmonds/android-bootslides20
Basically
bootloader can take you
3 different ways depending on which combination of buttons you press when you turn on your phone (there are other ways also like adb that comes with miflash ):
1. fastboot (vol down + power) -> you need PC (with drivers + fastboot tools --- miflash i.e.) connected via USB to phone (USB debugging enabled) and use command prompt to issue commands
2. recovery (vol up + power) -> you get graphical interface with less (
stock recovery/ move trough menu with volume buttons, select with power button) or more (
custom recovery like TWRP/ touchscreen works) options
3. system (power) = good "old" MIUI
Excercise 1:
Try to boot 1 (to exit fastboot you have to press power for a long time to turn off phone) and 2 (to exit recovery choose reboot system from the menu) for starters just to see how it looks.
Then go 3 (boot to system), enable developer options, enable USB debugging, install miflash on pc (from
http://en.miui.com/thread-207290-1-1.html), connect phone to pc. Follow steps 8 and 9 from
http://en.miui.com/thread-207290-1-1.html then type
adb devices in command prompt. On phone there should pop up request
RSA key fingerprint + always allow from this computer > allow. Response to
adb devices should be
serial number device. Now you are ready to boot 1 and 2 alternative way. Continue to:
Excercise 2:
To boot recovery - in command prompt type
adb reboot recovery - recovery boots, nice isnt it, now reboot to system (use menu)
Then fastboot - Follow steps 8 and 9 from
http://en.miui.com/thread-207290-1-1.html then type
adb reboot bootloader - fastboot boots, nice isnt it, then type
fastboot devices and response should be
serial number fastboot. Now type
fastboot reboot and phone reboots back to system. No pressing buttons needed.
Doing it:
If you managed this, installing TWRP should be a piece of cake like explained here:
http://en.miui.com/thread-207290-1-1.html and here
http://en.miui.com/thread-146299-1-1.html
Then making nandroid backup should be easy too:
http://trendblog.net/android-guide-make-nandroid-backup-android-phone/
The rest everyone here knows the best:
http://xiaomi.eu/community/threads/how-to-update-upgrade-miui.15424/