I am doing some Android hacking and have a system.img that is an ext4 in a sparse image Not sure if I need to recreate a sparse image to upload it at the moment (not got the tablet), so have been looking at sparse FS's and boy are they weird. I can unpack it using simg2img but get a crc error out of it.
simg2img system.img test.img computed crc32 of 0xe1b13ed7, expected 0x00000000
The result is a mountable ext4 image, but I am worried about the crc error. Update found a new copy of the ext4 utils that compiles and gives no error now.