How to cook my own stock rom

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TurokHunter47

Senior Member
Jan 30, 2014
74
14
28
Samsung Galaxy S21 Ultra
Hello, I have FTF file with KitKat 14.3.A.0.757, 7Zip, FTF EXTRACTOR and Android SDK and I want to create my own rom.
Tried FTF extractor and a lot of tutorials but, FTF extractor fails unpacking system.sin (don't know why)
AND I prefer to use my own.
If anyone can post a link or something I will appreciate.

XPERIA Z1 C6903
 

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