STM32F107 RBT6 + QCA8337 AL3C based router with serial and swd headers
Mainstream Connectivity line, ARM Cortex-M3 MCU with 128 Kbytes Flash, 72 MHz CPU, Ethernet MAC, CAN and USB 2.0 OTG
According to https://wiki.mikrotik.com/wiki/SwOS/RB250_RB260#Summary
new RB260GS (CSS106-5G-1S), new RB260GSP(CSS106-1G-4P-1S) supports SwOS v2.0 and newer.
Example working (as of 2018-07-06) url download links which work for CSS106-5G-1S:
https://download2.mikrotik.com/swos2/css106/swos-css1061g4p1s-2.0.bin
https://download2.mikrotik.com/swos2/css106/swos-css1061g4p1s-2.2.bin
dpavlin@lib10:/lib10/arh-hw/backup/Mikrotik-RB260GS-CSS106-5G-1S/rb260gsp$ md5sum * bf110ca7e1cd0558cefeacd9e0b62c19 swos-css1061g4p1s-2.0.bin a491bbf2732937839e6a8222a876cc7a swos-css1061g4p1s-2.2.bin f098106dfc8ac5ad0fedf0181c68d8de swos-css1061g4p1s-2.3.bin f4f74f697039a83baa99d37017251805 swos-css1061g4p1s-2.4.bin 90d2ec8571dd9d9aeab1bfbaaa99dea2 swos-css1061g4p1s-2.5.bin a7f046fc8a12b5ebeb85f9a4bb0dd275 swos-css1061g4p1s-2.6.bin a1e7adc6ad63e5560156b0f2b6f272ce swos-css1061g4p1s-2.7.bin
https://mikrotik.com/download (SwitchOS) latest version:
https://download.mikrotik.com/swos2/css106/swos-css106-2.13.bin
from web interface
Firmware Current Installed Version 2.7 (built at Fri Dec 15 2017 09:42:48 GMT+0100 (CET)) Latest Available Version 2.7 (built at Fri Dec 15 2017 09:42:48 GMT+0100 (CET))
SwOS v2.x - RB260GS(CSS106-5G-1S) and RB260GSP(CSS106-1G-4P-1S)
The new RB260GS(CSS106-5G-1S) and RB260GSP(CSS106-1G-4P-1S) has built-in backup SwOS firmware which can be loaded in case standard firmware breaks or upgrade fails:
Holding Reset button for few seconds while device is booting resets configuration and loads backup firmware SwOS 2.0p.
After loading backup firmware SwOS 2.0p it is possible to connect to 192.168.88.1 using web browser and install new SwOS firmware.
Current Installed Version 2.0p (built at Fri Oct 21 2016 10:18:39 GMT+0200 (CEST)) Latest Available Version 2.7 (built at Fri Dec 15 2017 09:42:48 GMT+0100 (CET))
After this, router knows that there is new version, but can't download it from http://upgrade.mikrotik.com/swos2/css106/swos-css106-2.7.bin
dpavlin@x230:~$ sudo ifconfig enp0s25 192.168.88.240 wget --http-user=admin --http-password='' 'http://192.168.88.1/!stats.b'
https://forum.mikrotik.com/viewtopic.php?t=162881
https://wiki.mikrotik.com/wiki/MAC_access
MNDP frames
sudo apt install mactelnet-client
dpavlin@klin:~$ mndp Searching for MikroTik routers... Abort with CTRL+C. IP MAC-Address Identity (platform version hardware) uptime 192.168.88.1 c4:ad:34:47:12:91 MikroTik (MikroTik 2.7 CSS106-5G-1S) up 113 days 4 hours 10.60.0.1 d4:ca:6d:1:4c:ed ccr (MikroTik 6.46.6 (testing) CCR1036-8G-2S+) up 113 days 4 hours XYIT-4UTW bridge60/sfp2-60