[Tutorial] How to use ADB + root to backup Android device partitions

[onetime]

Some confusions with Method 4. I extracted the zip but it doesnt have any "Install" files but a "romdump" file instead, what do I do ?

What's your phone's chipset?

I see the same thing - romdump_v82b just contains a elf file called romdump. And that file contains the following:
.ARM.attributes
.ARM.exidx
.ARM.extab
.bss
.comment
.ctors
.data
.data.rel.ro
.fini_array
.got
.init_array
.preinit_array
.rodata
.shstrtab
.text
NULL