What to do if your Signature Comfort M840 L mouse or accessory is physically damaged
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If your Logitech mouse or accessory is physically damaged, deformed, cracked, or broken, do not attempt to repair it yourself, as self-repair may void your warranty.
Contact Logitech Support so our team can inspect the issue and advise you on next steps.
Important Notice: Logitech Options has reached end of support and is no longer maintained. For the best experience with your supported Logitech devices, we recommend switching to Logi Options+, our next-generation customization software. Our team is here to help you during this transition.
Important Notice: The Presentation software is no longer supported or maintained by Logitech. Logitech Presentation devices are now supported by Logi Options+ for a better experience. We highly recommend using Logi Options+ with your presentation remotes. We are here to assist you during this transition.
As hardware and operating systems continue to evolve, legacy software eventually reaches a point where it can no longer be updated or maintained to current standards. Logitech Gaming Software (LGS) has been succeeded by G HUB for all new devices since 2019, and all hardware compatible with LGS is now out of warranty.
Effective October 31, 2026, all LGS installation files, download links, and support documentation will be permanently removed from the official Logitech website.
We understand some users may still want access to the installer in the future. We are currently exploring alternative resources to make this possible.
Important Notice: The Firmware Update Tool is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Important Notice: The Logitech Preference Manager is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Important Notice: The Logitech Control Center is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Important Notice: The Logitech Connection Utility is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Important Notice: The Unifying Software is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Important Notice: The SetPoint software is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
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