Hello,

Mitras LX7 uses the same firmware, so 6961 is the latest version also for your ProfiLux4:
https://www.aquariumcomputer.com/dow...le-esp-update/

If the upgrade does not cure the connection issues, check the signal strength of both (P4 and router/accesspoint) and/or choose mode 802.11 b/g, different wifi channels (not overlapping).