All Phones

Phone name Description
Nokia 8 Oreo firmware How to Flash Nokia Firmware using OST

P.S. Totally dangerous, read the forum carefully.
Lenovo K6 Power 1. Install Driver on your Windows Computer (if you have already installed the correct drivers then SKIP this step).
2. Extract Lenovo Downloader Tool on your computer.
3. Now, Open QcomDLoader.exe
Galaxy S6 (edge+ SM-G928) and SM-G920

1. Extract the firmware file.
2. Download Odin.
3. Reboot Phone in Download Mode (press and hold Bixby(Home button) + Power + Volume Down buttons).
4. Connect phone and wait until you get a blue sign in Odin.

LG Optimus L9 II 1. Download and setup LG Driver.
2. Download LG Flash Tool 2014 tool and extract.
3. Enter to Download Mode (shutdown phone then VolumeUP + Power after vibration release the Power button) and plug USB into your PC.
iPhone 3GS Official signed firmwares update.
1. Connect your iPhone or iOS device to your computer.
2. Select the device in iTunes online or downloaded version of iTunes.