Here you are:
$ sha256sum comi7-xiaomi-extender-ax1200-rc04-full-backup-prepared-with-openwrt-23.05.4-f9cf50339b10-ramips-mt76x8-xiaomi_mi-ra75-rc04-radio-squashfs-sysupgrade.bin
bf87f09990dedafdd7444f4eae0fc115fee70f5ac9cfea2b12f3adf76f1e768d comi7-xiaomi-extender-ax1200-rc04-full-backup-prepared-with-openwrt-23.05.4-f9cf50339b10-ramips-mt76x8-xiaomi_mi-ra75-rc04-radio-squashfs-sysupgrade.bin
The OpenWrt firmware was created by the Firmware Selector, adding those kmod-mt7615e and kmod-mt7663-firmware-ap packages.
I added the uboot-envtools package also to allow you to play with those environment variables! 