I am having the same problem and the above solution does not work for me.
New SDS100
Sentinel 2.03.02 on Win 10
I could never update firmware following directions in the Manual using micro USB cable.
1. I have Cleared User Data with SD Card in scanner and attempted Write to Scanner and Update Firmware (HomePatrol-2) multiple times unsuccessfully.
2. I have re-formatted SD Card with above app in PC and attempted Clear User Data, Write to Scanner and Update Firmware multiple times unsuccessfully.
3. I then re-formatted SD Card with above app in PC and inserted card in scanner and repeated #1 multiple times unsuccessfully.
4. I have repeated #1, #2 and #3 with a NIB SD card unsuccessfully.
5. I attempted #1, #2, #3 and #4 on another PC unsuccessfully.
6. I returned the SDS100 and received a new one from another vendor. I have repeated #1, #2, #3, and # 4, unsuccessfully.
Any suggestions?
Thanks in advance.