In need of some help!

I'm new to Enigma and Linux, and am struggling to change my bootlogo screen. I am using BH 2.0.5 configured up from Ten Belows backup. The instructions appear simple enough:- back up to PC the .mvi files in /usr/share and replace with provided .mvi file. In said folder I have five .mvi files, backing them to the PC then deleting and replacing with new .mvi file then restarting . . . I still have original boot screen. Clearly I am doing something wrong - but what? I note that I also have three folders (bootlogo.mvi, bootlogo_wait.mvi and backdrop.mvi) which telnet fails to open but may be a linux convolution of which I am ignorant. Also there is a folder vuplus-bootlogo containing three files (backdrop.mvi, bootlogo.mvi, and bootlogo_wait.mvi) whiuch again may just be a convolution. Please help.