My phone is rooted and I have CM12 installed. Now I tried to install CM12.1, following these instructions:
1. Factory Reset / Wipe data
2. Copy CM-12.1.zip to SD card (optionally copy gapps to SD card)
3. Boot into recovery
4. Flash CM-12.1.zip
5. Optionally flash gapps
6. Reboot to bootloader
7. Flash boot.img from CM-12.1.zip via fastboot
Wait for "Optimizing apps" (it can take up to 30 minutes in some cases, so, please, be patient)
Thing stops at step 7, where FASTBOOT offers me only four options: hboot, reboot, reboot bootloader, power down.
Basically I cannot get to the point where to flash boot.img. What's missing?
I also made pictures of the menus but this forum doesnt allow me to share links..