Hey guy's its very easy to change bootup sound for mmx A75 rooted device....upload some good boot sound file..
Rename desired file to "bootaudio"(file format in .mp3) and replace it with the file in the "/system/media/" .
To go to the path use any root explorer apps( i used ES file explorer)
Now reboot your system and enjoy.......:thrasher:
i did the same but whenever I tried to paste the bootaudio it says operation failed. i used in ES file Explorer
Rename desired file to "bootaudio"(file format in .mp3) and replace it with the file in the "/system/media/" .
To go to the path use any root explorer apps( i used ES file explorer)
Now reboot your system and enjoy.......:thrasher:
You must be rooted 1st and you need to mount /system as rw and not ro..
if they knew what root was, i wud have my warranty revoked 
Lol...i changed my splash logo, boot animation, boot sound, shut animation, ub-1 rom, cwm, build no, sw ver.....and when the svc guys looked at it, they asked "market mein aise bhi app milte hain kya? kya masti hain!"
Buddy....I remember everything except the slash logo thing.....cant remember where I found it
Btw for the boot and shut animation, just search for bootanimations with resolutions of our phone on google. If the resolutions dont match for a bootanimation that you like, just post again....I will tell you how to edit it yourself for ur screen.
now, Make a backup of your original files from system/media. Then replace the new bootanimation files and set the permission as positive for all except the last column.
Rest of the things you can simply do it by editing the build.prop with a text editor and editing the software names, android version.
I have a cm9 bootanimation....and nexus x boot as the shutanimations respectively.
Buddy....I remember everything except the slash logo thing.....cant remember where I found it
Btw for the boot and shut animation, just search for bootanimations with resolutions of our phone on google. If the resolutions dont match for a bootanimation that you like, just post again....I will tell you how to edit it yourself for ur screen.
now, Make a backup of your original files from system/media. Then replace the new bootanimation files and set the permission as positive for all except the last column.
Rest of the things you can simply do it by editing the build.prop with a text editor and editing the software names, android version.
I have a cm9 bootanimation....and nexus x boot as the shutanimations respectively.
You can't change the splash screen manually I am 100% sure that is the thing when u flash
The splash screen is renamed as Logo.bin where its a .Bin file
The file has charge animation and splash logo..So its hard to change
as well is tried to edit it with hex editor logo in .bmp format 24 bytes
but i am not getting it. i changed it as .bin and flashed some errors
mobile is not booting
u can try that too @DG
