If you mean actual support for Windows 11, apparently not. According to the service manual, there's no procedure for replacing the CPU, which would imply that it's soldered to the motherboard. In any event Dell will not provide Win 11 drivers for the 5755. You may be able to install Windows 11 regardless, though driver compatibility and upgrades could be a concern.
Inspirion 17 5755 with AMD A8-7410 processor. But it is not Win 11 compatible with this CPU. Is it possible to upgrade the CPU on this laptop to something that is Win 11 compatible?
Inspirion 17 5755 - Is it possible to upgrade CPU to be Win 11 compatible?