You need to modify the update-script
Before
After
Open OTA .zip on PC, open meta-inf/com/google/adndroid/update-script
Replace everything with my script from "after"
Now you can:
1. Do a factory reset
2. Flash cm-12.1-YOG7DAS2K1
3. Flash cm-bacon-cee4e8702d-to-e36dd78050
4. Dont mind about recovery or smth else