internal storage or /system? i formated my /data partition so have absolutely nothing!
I had the same issue flash the system image with twrp
sent from my 6.0.1 deodexed HTC One A9
Here are all the files you'll need. If you're not on 6.0.1, download 2PQ9IMG.zip and put it on the root of your SD card, and flash it. Then, after that, download the superr_6.0.1 zip, extract files and use fastboot to flash them.