Main Menu does not appear cannot be accessed

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”