This is the first time I'm using TWRP... excuse me for asking stupid questions! I tried using CWM, and it couldn't mount the sdcard, so that's why I went TWRP.
When I try to install the update.zip again using TWRP, it says:
mount: failed to mount /dev/block/platform/msm_sdcc.1/by-name/userdata at /data: Device or resource busy
I'm assuming I need to do something before?
Looks like I'm just impatient, I thought the process had failed due to this message. The boot process continued and I rebooted, and sMiUI is installed properly. This was a bit of a hairy experience lol. Thanks @
desper !
FWIW, adb/fastboot via Mac works fine too