Bootloader unlocking for suzu: Back up TA partition, accept unlock code, flash OEM binaries for AOSP

[vasyugan]

At the moment, the installer is dysfunctional for suzu:

• It cannot back up the TA partition, which must be done before unlocking the boatloader, or you can never revert to factory state (happened to me)
• I doesn't hint at the need to obtain an unlock code from sony and provides no opportunity for entering it.
• It doesn't flash or hint at the need to flash the OEM binaries for AOSP BEFORE proceeding with the installation, so that the Ubuntu recovery installed ends up in a boot loop, and thus, installation doesn't get completed

I think that therefore when the installer detects a locked bootloader it should stop and provide a link to the instructions, I have written them down here and I would think they should be on the device page, because that's obviously the place where you look first.

[Flohack74]

@fredldotme what do you think, what would be a good UX for that?

[NeoTheThird]

Here's how this looks in the wild #1071

[fredldotme]

Aargghh, if I just didn't miss the notifications. Alright, so the device unlock UX I'm not sure we can do easily without implementing a lot of things in the installer, so I would recommend hinting on the requirement in the device config, let that surface to the user in the installer UI and link them to a new forum thread I could set up specifically to guide the user.

[NeoTheThird]

I'm always a fan of automating as much as possible, if it's just a matter of passing the key for the oem-unlock, i'm happy to implement a UI for that. If you have ideas on how a note could look, could you send a PR to the config?

[fredldotme]

I noticed we already have a guide for TA backup, unlocking etc. on suzu's devices.ubuntu-touch.io page, we could show that one after showing the hint about the Android 8 requirement.

[NeoTheThird]

Manual downloads for flashing the oem partition are included in 0.5.6-beta. If someone wants to add it to the config files where it's needed, i'd be very appreciative. See the notes for developers on the release for usage documentation.

[NeoTheThird]

Opened #1479 to track those new-fangled unlock requirements. For the rest, i'll update the config accordingly.

[robiwan1]

the easiest way to add unlock code to the "fastboot oem unlock..." command is to ask in the UI and/or add an option in the config file, because there is already an option in the ubports-installer to view/edit the selected config file...

[NeoTheThird]

@robiwan1 we're going to have an ui, that's being tracked in #1479