cAP XL Bricked

Hello,

I have a network already configured based on router RB3011UiAS and few CAP ACs RBcAPGi-5acD2nD - all working under 6.49.15 version.
I bought cAP XL, it had version 7.13 installed. After some time I figured out that it’s not going to work as other cAPs and decided to downgrade it - cAP XL was visible in Winbox, I was able to connect to this device, I read in config that factory version is 6.48.4 so this one should work. Unfortunately after downgrading I’m not able to connect with it - I made a reset multiple times, holding reset 5secs, 10secs, also 15secs to enable Netinstall, but this devicxe also does not show up there. LEDs are lighting, it seems to be working, but I’m not able to use this one. After resetting to CAPsMAN mode (10 secs reset) it does not automatically work with my network configuration, but other cAPs (older ones) do it as expected. What I can do now?