MikroTik SXT SA5 ac not booting OpenWrt from RAM

This MikroTik SXT SA5 ac unit doesn't apply network configurations in WinBox/WebFig, but it does save the boot config. I have successfully sent it the openwrt-18-06-4-ar71xx-mikrotik-vmlinux-initramfs.elf file via dnsmasq (as described here) both by changing config to try-ethernet-once-then-flash and by holding the reset button during boot. The device beeps once, but OpenWrt never boots, never works. Any hints?

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