I bought it about 3-5 years ago, it has a stock software (web-interface is inclouded). I know that it suports openwrt, the seller provided openwrt software, but also mentioned that it's not really ready yet. This software is lost now.
here are some pics to help you to help me
advanced port scanner helped to find out that it is a yuncorebord
Also I know that it has a Qualcomm IPQ8072A cpu and I suppose this could be the correct software to flash.
How do you think shall I flash it with it or I need some other software?
Also, please explane, if I want to flash openwrt can I use openwrt version that is for another router with the same cpu?
The 4 pins on the left side of the heatsink are serial/JTAG ports, so you can backup your u-boot and mtd flash partitions, then try to flash it with https://openwrt.org/toh/hwdata/yuncore/yuncore_ax880 . At least if you have a brick you can use serial to restore it.