|Version||Release date||firmware link||Notes|
|OpenWrt Trunk/Snapshot||2017||https://downloads.openwrt.org/snapshots/trunk/ar71xx/mikrotik/openwrt-ar71xx-mikrotik-vmlinux-initramfs.elf||OpenWrt Trunk/Snapshot builds mikrotik-vmlinux-initramfs.elf|
|LEDE Trunk/Snapshot||2017||https://downloads.lede-project.org/snapshots/targets/ar71xx/mikrotik/lede-ar71xx-mikrotik-rb-nor-flash-16M-initramfs-kernel.bin||LEDE Development Version, Working, Port 1 WAN, 2-5 port LAN, All Working|
|LEDE Trunk/Snapshot||2017||https://downloads.lede-project.org/snapshots/targets/ar71xx/mikrotik/lede-ar71xx-mikrotik-rb-nor-flash-16M-squashfs-sysupgrade.bin||LEDE Development Version, flash-16M-squashfs-sysupgrade.bin|
Note for LEDE Development version, Yes is working as of r4049-9412fc2 but may contain bugs! No LuCI/Web interface is included so please wait for LEDE or OpenWrt newer release if you need this Stable! https://lede-project.org/docs/guide-quick-start/developmentinstallation#installing_a_lede_snapshot
LEDE Stable 17.01.1 (2017-04-18) LANs are NOT WORKING again only the snapshot builds are working with LEDE!
Download Winbox from Mikrotik webpage https://download2.mikrotik.com/routeros/winbox/3.11/winbox.exe
Boot up the RB750r2, connect your DHCP client to any of the ports 2 to 5 but not the Internet labled port (Port 1)
Open up Winbox, IP Address 192.168.88.1, If a password has been set put this in if not the Default is just Blank
System → Routerboard → Settings → Boot device: Try ethernet once then NAND System → Routerboard → Settings → Boot protocol: DHCP System → Routerboard → Settings → Force Backup Booter: Checked (if supported by your routerboard - !IMPORTANT) System → Shutdown
Connect the LAN port on Internet labled port and reboot the RB750r2, Connect the computers LAN port on Internet
Please note that the aforementioned mechanism is not properly working on some boards. Don't worry, boot up the mikrotik board, connect your DHCP client to port 1. An address from 192.168.88.0/24 must be obtained. You can now telnet to the board, and configure it for TFTPboot.
Telnet user is
admin, leave the password empty.
telnet 192.168.88.1 system routerboard settings set boot-device=try-ethernet-once-then-nand system routerboard settings set boot-protocol=dhcp
Now reboot the board, it should boot from the labled "Internet" port now.
For Windows 7 SP1 x64 (XP/Vista should be ok)
Download http://tftpd32.jounin.net/tftpd32_download.html (i used tftpd64 portable edition) and the mikrotik-rb-nor-flash-16M-initramfs-kernel.bin and mikrotik-rb-nor-flash-16M-squashfs-sysupgrade.bin from Downloads above and then save them in the same tftpd32 folder IMPORTANT
Extract the tftpd32 folder and make sure mikrotik-rb-nor-flash-16M-initramfs-kernel.bin is there and open up tftp32 config file and match theses settings i have (worked for me)
4C:5E:0C:XX:XX:XX=192.168.1.250 (Should be the same ETH1 MAC Address) BootFile=lede-ar71xx-mikrotik-rb-nor-flash-16M-initramfs-kernel.bin Lease_NumLeases=2 IP_Pool=192.168.1.2 PoolSize=4 Mask=255.255.255.0 Gateway=192.168.1.1 Lease (minutes)=90
Open up tftpd64.exe and the go to Settings > GLOBEL and make sure, TFTP server and DHCP are ticked, everything else untick, Save and Exit and then reopen tftpd64.exe for the saved changes!
Set a static IP on your Windows computer LAN port with the following
192.168.1.2 (Keep this to 192.168.1.2 or tftpd wont work **IMPORTANT**) 255.255.255.0 (**IMPORTANT**) 192.168.1.1 (**IMPORTANT**)
Follow method 1 to enable TFTP, Once done keep the LAN on port 1 (interent port) and then you should see something transferring and then the RB750r2 will boot into LEDE, Unplug the LAN port from Internet port 1 and set a DHCP on your Windows machine and then plugin the LAN port into any port 2-5 and the Internet port for a Cable Modem? Switch? Router? something that has internet access to it if you want to keep the LEDE on as this is in RAM mode and wont save any changes!
Now, If you want to erase you RouterOS then follow theses steps;
Log into SSH 192.168.1.1 with just root and password been blank (press enter)
cd /tmp wget http://downloads.lede-project.org/snapshots/targets/ar71xx/mikrotik/lede-ar71xx-mikrotik-rb-nor-flash-16M-squashfs-sysupgrade.bin sysupgrade lede-ar71xx-mikrotik-rb-nor-flash-16M-squashfs-sysupgrade.bin
Snapshot dated 28/04/2017, Maybe fixed in a Stable release? I got this error but all seems to be working fine! https://forum.openwrt.org/viewtopic.php?pid=357278#p357278
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Ports 2-5 directly correspond to ports 2-5 as labeled on the unit, port 1 is the Internet (WAN) on the unit, 0 is the internal connection to the CPU.