You have to extract the firmware first.  No firmware for any ThinOS device is over 100 MB...Yet. If you extract that file you will find that it is either the Merlin image, or it contains the packages as well as the firmware.  You can only upload the firmware via this interface.  
[IMAGE]Firmware File Upload - 100MB Limit Is it possible to upload a ThinOS firmware file into WMS 1.2 that are greater than 100MB. Some of the newest firmware files are 160MB+ in size. I have tried copying it to the .../OSImages/zipped folder (copying the process for WES images) but they result in an error. Currently, have a case open with Dell Support.
Uploading ThinOS Firmware File - 100MB Limit