upd: I'm talking about P110 plugs, thankfully all P115 are on 1.3.4 FW...

Hello! My P115 plugs stopped working on 1.4.0 in my Homebridge smart home. Now it gives 403 error in log but my last non-updated P115 on 1.3.4 is working PERFECTLY. How can i revert/downgrade FW to...