unable to mount /data, /system and /cache on Android phone (Asus Zenfone 5 (501cg , t00f)
Had same issue with my 3.5 year old Zenfone 5. Tried almost everything to save it but nothing worked. It would not update the recovery even when fastboot flash was successful. Figured out it was failed EMMC and many other users faced the same issue in the same time period. Asus might had planted a uesd time trigged failure tech or something (Just guessing by the amount of similar failure in same time period of a month). Well i fixed mine by getting a ZF5(free :p) from a friend (his phone was not uses much as it had a broken screen maybe thats why it didn't failed) and then replaced my Motherbord with his.