How to I get rid of a partial firmware update download (50%)? The downlaod failed part way through but the Mimo app only now offers to install the upadate. There seems no option to re-download or even delete the partial download. Very wary of going ahead with the install as it's incomplete!

Any ideas?

Have you tried to delete the cache in storage on the App to see if that might work?  If you have to delete the data also in Storage be sure and back it up first.  

The download typically doesn’t show 100% until the camera is connected & the firmware applies hence the message to install it.

Hi, Sleekit. Thank you for reaching out. May I ask what is the current firmware of the Action 4? If it is not v01.04.05.10, please reinstall the Mimo app from this link. Please make sure all necessary files are backed up before doing so.