@contiomega For RMA you can send it to another country by post they have instructions for it. For BROM mode, there are some guides in the internet for unlocking it (or something like https://www.hovatek.com/blog/how-to-force-a-mediatek-device-into-brom-mode/), but I hadn't heard that it can be locked before.

@MrT10001 What if the computer does not see the device anymore?

It is poor adb drivers in Windows 11. My main Windows 11 setup, works fine, but my other always puts an exclamation mark over the device in device manager and tells me the drivers aren't installed. My usual resolution to this is to update or install Android studio, but this hasn't resolved it recently. This is really irritating as I need to test USB 2.0 to unlock an Xiaomi phone to discount USB 3 as an issue (my main Win 11 setup is all USB 3.0) and this setup won't see the device correctly - you need windows tu unlock the bootloader on an Xiaomi device.

Updating with ubports installer coming from lineage worked seamlessly on my nexus 4. (The automatic device detection was a bit tricky, but i think this hasn't to do anything with lineage.)