Powerbeam M5 300 eeprom

Hi guys!

I need little help. I have Ubiquiti Powerbeam M5 300 with latest 6.2.0 firmware. My ISP lock out from the device, and maybe misconfigured something because i have several ping spikes. Can i somehow with eeprom flasher (CH341A) or through serial connection backup the configuration file, or access to device configuration? I want to backup configuration, flash openwrt, and load password etc. Thanks for anyone for answer! (Sry for my english:))
Here is pcb picture.