RouterOS automatically splits the partitions to even sizes, and you current partitions OS+config is untouched, as long as there is enough free space to split the NAND/Flash into the selected number of partitions. the router reboots when you change the number of partitions (/partitions repartition partitions=2).
Repartition to 2 partitions (PROD, TEST) or 3 partitions (PROD, QA, TEST). Upgrade the firmware to latest (/system routerboard. Check you have enough free space for the extra partition (/system resource print). If a partition completely fails for some reason (failed upgrade, problematic configuration introduced, software problem), the next partition will automatically boot instead. You may then upgrade the test partition, and if it do not work as expected, you can reboot into the untouched production partition. A very convenient way to prepare for this, is to add extra partitions on the router. When upgrading, you always run a risk of getting unforeseen problems. Read more on the wiki about Upgrading RouterOS. If you want your router to update during the night, you can edit the date and use this script: You can script the updating, from your own proxy server, here is an example - also check the Wiki about scheduler. See Winbox: System ⇢ Auto upgrade or use /system upgrade print Or you can add the different RouterOS images you want to use on a master MikroTik router, and set the other routers to use that router as the upgrade central. If you have many MikroTik devices you need to manage and update, you can use The Dude to update them in batches. The chipset is shown in parentheses in the top of the Winbox window, after the routers identity (name) - using the wrong chipset software might brick your router. 
For home devices, put the software in the flash folder, otherwise it will be deleted at reboot. Be sure that you use the software version that matches your MikroTik devices chipset. Then you reboot, and RouterOS automatically discovers the software and installs it before starting up.
To manually update, you simply download the new software and with the mouse/pad drag the file to the Winbox file window.
Or from Winbox, press System ⇢ Packages ⇢ Check For Updates ⇢ Download&Install
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