yeah, Grid is the default when you 1st update firmware to 2.02.32
but if you want the old Mochi theme … then you select it in Setup > Appearance > User Interface Themes > Mochi
you Don’t have to do a Firmware Rollback to get the old theme as you stated … and to quote it again
“If you want to go back to the old style main menu you have to rollback to the previous firmware”