Esto está mal escrito.....
adb remount
adb shell mount -a
adb push recovery-RAv1.2.1G.img /system/recovery.img
adb push recovery-RAv1.2.1G.img /sdcard/recovery-RAv1.2.0G.img
<- 1.21 o 1.2.0 en que kedamos ? 
adb shell flash_image recovery /sdcard/recovery-RAv1.2.1G.img
adb reboot