Android
Downloads
Change OS on Samsung (Galaxy S10+)
Unlock Bootloader
Become Developer Settings → About → Tap repeatedly on Build Number
Allow bootloader unlocking in Developer options → enable OEM unlocking
Power off your device. Then press Bixby + Volume Down and plug in your device to a PC to boot into download mode
Long press Volume Up button to unlock the bootloader. (Will wipe your data and automatically reboot)
Go through the initial setup again
Setup a WiFi Connection (for some reason this is required for real…)
(Re)Enable developer options, and confirm that the OEM unlocking option exists and is grayed out
Rooting
Download Mode
Once the phone has been turned off, press and hold the Volume Down and Bixby buttons together.
While holding the buttons, connect your Galaxy S10 to the PC using the USB cable.
You should now see a ‘Warning’ message on your phone’s screen.
Recovery Mode
Press and hold the Volume Up, Bixby, and Power buttons together.
Keep holding the buttons until you see the Recovery screen.
or (with working adb)
adb reboot recovery
Get TWRP ontp Samsung S10+
Tutorial from: https://xdaforums.com/t/recovery-official-3-6-1-x-twrp-for-galaxy-s10-e-5g-exynos.4180287/
Make sure OEM Unlock is ON in developer settings
Turn off the phone
Use vol down + bixby key + usb cable plugged to a pc to start the phone in download mode
Long press vol up then confirm you want to unlock bootloader (this is needed one time only)
Warning
Please be aware all your data will be erased including internal storage and phone will reboot!!
Let the phone boot normally, pass the setup and connect to internet (wireless or mobile data) in order to unlock RMM
Make sure OEM Unlock is ON in developer settings
Turn off the phone
Use vol down + bixby key + usb cable plugged to a pc to start the phone in download mode, short press vol up to confirm you want to go to download mode
Note
If by any chance you see RMM state=Prenormal or KG state=Prenormal, redo from step 5!
Download appropriate TWRP .tar file according to your device
Download avb disabled vbmeta .tar from: https://downloads.corsicanu.ro/samsung/vbmeta-27.10.2020/vbmeta.tar
- Open Odin v3.14.1 and place the downloaded TWRP .tar file in AP tab, downloaded vbmeta .tar file in CP tab and click Start
once you press start grab the phone and press vol up + bixby + power to force it boot straight in TWRP after flashing