You can update almost every Samsung SSD Firmware via ISO, ok you need a bootable DOS stick, but you can create one under linux, too.
http://www.samsung.com/semiconductor/minisite/ssd/download/tools.html
Only 840 Evo had one firmware that was only available via magician.
None of the stuff on that site works with my 850pro as far as I've seen.
./magician --list
================================================================================================
Samsung(R) SSD Magician DC Version 2.0
Copyright (C) 2015 SAMSUNG Electronics Co. Ltd. All rights reserved.
================================================================================================
----------------------------------------------------------------------------
| Disk | Model | Serial | Firmware | Capacity | Drive | Total Bytes |
| Number | | Number | | | Health | Written |
----------------------------------------------------------------------------
No Samsung SSD found!
The iso's specifically say 840 or older
You could be right, if a firmware update is released, they might update the tools.