I created a patched version of the logo.bin for remove the "unlock message".
I use the tool "Moto Boot Logo Maker" and the original logo.bin from stock.
You can download from here:
As regular, you can flash from bootloader mode using:
fastboot.exe flash logo logo-g5-fix.bin
(made by user atrac17)
I created this version as I feel the one around here is a G4 logo.bin. This uses the original logo.bin from G5.