Fender® G-DEC® 3 Memory Lock function  View products this
article applies to ...  I've come across the Mem Lock (Memory
Lock) function on the Fender G-DEC 3. What does it do? The
Memory Lock function is located in the Utilities menu and is
designed as a safeguard against accidental overwriting or
deletion of Presets on the Fender G-DEC 3. When the Memory Lock
is on, saving changes to Presets is not permitted. This can be
useful if you haven’t backed up your Presets in a while using
Fender® FUSE™ or if you borrow a friends SD card and don’t want
to change any of their Preset data.