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toh:mikrotik:rb760igs [2021/12/27 13:33] – created danijeltudektoh:mikrotik:rb760igs [2023/11/16 22:47] – [Installation] Explain why 23.05 except RC3 isn't netbootable rom4nik
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 Follow [[toh:mikrotik:common|MikroTik Common Procedures]] to install the OpenWrt firmware. Follow [[toh:mikrotik:common|MikroTik Common Procedures]] to install the OpenWrt firmware.
 +
 +**Warning**: use **[[https://downloads.openwrt.org/releases/23.05.0-rc3/targets/ramips/mt7621/openwrt-23.05.0-rc3-ramips-mt7621-mikrotik_routerboard-760igs-initramfs-kernel.bin|openwrt-23.05.0-rc3]]** for the first step of the TFTP installation, as **the other RCs and the final 23.05.0 version cannot be netbooted** due to too high entry point addresses:
 +
 +<code>
 +$ for file in *760igs*; do echo $file; readelf -h $file | grep Entry; done
 +openwrt-22.03.5-ramips-mt7621-mikrotik_routerboard-760igs-initramfs-kernel.bin
 +  Entry point address:               0x80b71000 <-- netbootable
 +openwrt-23.05.0-rc1-ramips-mt7621-mikrotik_routerboard-760igs-initramfs-kernel.bin
 +  Entry point address:               0x80b91000
 +openwrt-23.05.0-rc2-ramips-mt7621-mikrotik_routerboard-760igs-initramfs-kernel.bin
 +  Entry point address:               0x80b91000
 +openwrt-23.05.0-rc3-ramips-mt7621-mikrotik_routerboard-760igs-initramfs-kernel.bin
 +  Entry point address:               0x80b81000 <-- netbootable
 +openwrt-23.05.0-rc4-ramips-mt7621-mikrotik_routerboard-760igs-initramfs-kernel.bin
 +  Entry point address:               0x80b91000
 +openwrt-23.05.0-ramips-mt7621-mikrotik_routerboard-760igs-initramfs-kernel.bin
 +  Entry point address:               0x80b91000
 +openwrt-23.05.1-ramips-mt7621-mikrotik_routerboard-760igs-initramfs-kernel.bin
 +  Entry point address:               0x80b91000
 +openwrt-23.05.2-ramips-mt7621-mikrotik_routerboard-760igs-initramfs-kernel.bin
 +  Entry point address:               0x80b91000
 +
 +</code>
 +
 +Discussion: https://github.com/openwrt/openwrt/issues/13255#issuecomment-1772098866, https://forum.openwrt.org/t/mikrotik-hex-s-rb760igs-cant-boot-via-tftp/175012.
 +
 +----
 +
 +**Warning: Don't upgrade RouterOS packages & bootloader to 7.2.1 otherwise 'sysupgrade image' install will fail!**
 +
 +[[https://github.com/openwrt/openwrt/issues/9763#issuecomment-1107924638|(downgrade to 6.46.4 verified ok)]]
 +[[https://forum.openwrt.org/t/mikrotik-hex-s-rb760igs-cant-boot-via-tftp/175012|(downgrade to 6.48.6 verified ok)]]
  
 Quick guide: Quick guide:
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 ===== SFP ===== ===== SFP =====
 Fiber SFP is broken in 21.02. [[commit>?p=openwrt/openwrt.git;a=commit;h=54ed38d5ea|This patch in master]] fixes it, but it is not backported to 21.02, so you have to use snapshot builds if you use fiber SFP modules. Copper modules should work in 21.02. Fiber SFP is broken in 21.02. [[commit>?p=openwrt/openwrt.git;a=commit;h=54ed38d5ea|This patch in master]] fixes it, but it is not backported to 21.02, so you have to use snapshot builds if you use fiber SFP modules. Copper modules should work in 21.02.
 +
 +===== Photos =====
 +==== PCB ====
 +{{media:mikrotik:rb760igs:pcb_bottom.jpeg?400|PCB top-side of MikroTik RB760iGS}}
 +{{media:mikrotik:rb760igs:pcb_top.jpeg?400|PCB bottom-side of MikroTik RB760iGS}}
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