Canon EOS 77D Instruction Manual page 461

Wi-Fi
Wi-Fi cannot be set.
If the camera is connected to a computer, GPS receiver, or other

device with an interface cable, Wi-Fi functions cannot be set. ([51:
Wireless communication settings] will be grayed out.) Disconnect
the interface cable before setting any functions.
Refer to the Wi-Fi (Wireless Communication) Function Instruction

Manual.
Operation Problems
I cannot change the setting with the <6>,
<5>, or touch screen.
Set the <R> switch downward (lock release, p.57).

Check the [54: Multi function lock] setting (p.57).

A camera button or dial does not work as expected.
Under [54: Custom Functions(C.Fn)], check the [14: Custom

Controls] setting (p.409).
During movie shooting, check the [V btn function] setting (p.317).

During touch screen operations, the beeper suddenly
sounds softer.
Check if your finger is blocking the speaker (p.28).

Touch operation is not possible.
Check if [53: Touch control] is set to [Standard] or [Sensitive]

(p.73).
Troubleshooting Guide
461