Hello,
Does exist any build for the Galaxy S3 Mini (i8190)?
Regain your privacy! Adopt /e/ the unGoogled mobile OS and online services
I think your best chance of having this device supported would be thanks to excellent unofficial ROM builders such as @petefoth, @itsclarence, @LaurentG and many more, I cannot name them all.
Try contacting them, or make a post in the unofficial builds section
Download : Golden TWRP
Sources and HowTo : [RECOVERY][golden] TWRP 3.x | XDA Forums
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Download LineageOS : Nougat and Oreo
Sources and HowTo : [ROM][7.1.2] LineageOS 14.1 for GT-I8190/GT-I9070 [2017-06-09] | XDA Forums
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