y estos son los comandos desde el fastboot para instalarla:
fastboot boot recovery-RAv1.2.0G.img
adb shell mount -a
adb push recovery-RAv1.2.0G.img /system/recovery.img
adb push recovery-RAv1.2.0G.img /sdcard/recovery-RAv1.2.0G.img
adb shell flash_image recovery /sdcard/recovery-RAv1.2.0G.img
Reboot
