Android .obb editing, Help

[Shokoniraya]

hello guys
i need some help to repack .obb file from android games
as you know, some android games has .obb file and we can extract as zip or open with 7zip, Winrar or any zip extractor
but how can i replace files?
is this because of compression type or size?
i did it with zip.bms and zip2.bms
both script can works fine and i can import file and game can read file as well
but how can i re-create or import bigger file?

if i use Quickbms, i cant import bigger file
and if i repack or replace or re-create whit 7zip or winrar, game stuck and cant run or show a empty black screen

please someone help about this

[LolHacksRule]

hello guys
i need some help to repack .obb file from android games
as you know, some android games has .obb file and we can extract as zip or open with 7zip, Winrar or any zip extractor
but how can i replace files?
is this because of compression type or size?
i did it with zip.bms and zip2.bms
both script can works fine and i can import file and game can read file as well
but how can i re-create or import bigger file?

if i use Quickbms, i cant import bigger file
and if i repack or replace or re-create whit 7zip or winrar, game stuck and cant run or show a empty black screen

please someone help about this

What game OBB? Is the file header odd?

[Shokoniraya]

hello guys
i need some help to repack .obb file from android games
as you know, some android games has .obb file and we can extract as zip or open with 7zip, Winrar or any zip extractor
but how can i replace files?
is this because of compression type or size?
i did it with zip.bms and zip2.bms
both script can works fine and i can import file and game can read file as well
but how can i re-create or import bigger file?

if i use Quickbms, i cant import bigger file
and if i repack or replace or re-create whit 7zip or winrar, game stuck and cant run or show a empty black screen

please someone help about this

What game OBB? Is the file header odd?

Header is PK (Zip File)
but game will show a black screen when i replace file
what should i do?

[LolHacksRule]

Maybe there's hash checking or file integrity checking in the game (didn't say), if so, you have to figure out how to either fake the check, disable it or make it pass.

[Shokoniraya]

Maybe there's hash checking or file integrity checking in the game (didn't say), if so, you have to figure out how to either fake the check, disable it or make it pass.

that was CRC32 Checker!
thank you for help

for other guys, (if sometime... maybe someone need this)
find CRC32 in obb header and write primary CRC (CRC will change if you replace again, that means updating file)
and do it in every time if you replace it again

[LolHacksRule]

You're welcome for helping.