For first-timers:

• Download ROM zip and recovery zip.
• Boot to bootloader.
• Run fastboot update –skip-reboot recovery-YAAP-*.zip
• Follow Firmware flashing steps.
• Run fastboot reboot recovery
• Format data with the recovery.
• Click apply for update.
• Run adb sideload YAAP*.zip
• Reboot to system.
  
  

For first-timers(SD card):

• Download ROM zip and recovery zip.
• Copy ROM zip to SD card.
• Boot to bootloader.
• Run fastboot update –skip-reboot recovery-YAAP-*.zip
• Follow Firmware flashing steps.
• Run fastboot reboot recovery
• Format data with the recovery.
• Click apply update with SD card.
• Choose the ROM zip and click the power button to confirm.
• Reboot to system once it is flashed.
  
  

For dirty-flashers:

• Download ROM zip.
• Follow Firmware flashing steps if fw is updated.
• Boot to recovery.
• Click apply for update.
• Run adb sideload YAAP*.zip
• Reboot to system.
  
  

For OTA-flashers:

• Follow Firmware flashing steps if fw is updated.
• Boot back to system.
• Go to Settings->System->YAAP Updater.
• Click Download.
• Be very patient after this step as OTA is a slow process and will take approximately 30-45 minutes (It would specifically be stuck at 68% for that amount of time alone!).
• Reboot after it is done.
  
  

Firmware flashing steps:

• Download recommended fw.
• Boot to bootloader.
• Run fastboot update –skip-reboot sunny-fw.zip