S3 Neo Unlocking Help - Galaxy S3 Neo Q&A, Help & Troubleshooting

Hello guys
I am a total expert in rooting but a noob about sim lock and unlock.
Currently I have a GT-I9301i running CM12.1 which is very buggy. So I want to revert back to stock.
My phone came unlocked
Now if I flash any rom from sammobile, will it remain unlocked or will it be locked again ??
Please help. Any help will be appreciated.

As far as I know, our device's firmwares are unlocked, pretty sure it will remain unlocked. Correct me if I'm wrong..

Thanks

Please do provide more info if you get

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GT-i9515 Bootloader Unlocking and Custom Rom flashing

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S5 G900v convert to G900f or Any model[ Help Xda Brothers ]

Pls Xda Brother Help , my s5 is g900v made in china. Tethering need no subcription problem. I don't like g900v , so I have to change G900v convert to g900f or Any version please Solution Xda Brothers.
Which G900f custom rom suitable for g900v
It is not worth it to put a g900 any other version firmware on your device it causes instability crashes and corrupted data I know I converted my g900v to be a g900f and other variants the only safe way I know of is this thread I made to place a g900f custom rom on a g900v device it still causes instability and risk of data corruption though but here you go data and calling and messaging work to the best of my knowledge
Be careful to follow all steps in below guide if you have any questions please ask
The below guide requires root and an unlocked bootloader if you can't unlock your bootloader flashing this rom will hardbrick your device don't flash it on a bootloader locked phone
https://forum.xda-developers.com/ve.../aicp-nougat-prealpha-avaliable-klte-t3471954
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