Bootloader redesign for Trezor T 🥾

[tsusanka]

Spec: Notion
Design: Figma and here:

Text to be finalized.

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A nice to have feature from Product is to slightly redesign the bootloader.
Prerequisites are:

• Remove Connect to host dialog in bootloader #1039
• bootloader: Add "Wipe device" button #60

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Our general idea is to have a homescreen with a user-friendly explanation what just happened and what bootloader is. Next to that we are proposing a hamburger-like menu. This menu contains:

• Display firmware info (header and version)
• Display firmware fingerprint
• Factory reset (wipe including the firmware), basically bootloader: Add "Wipe device" button #60
• Launch firmware (= reboot)
  - Boot counter (maybe), Increment boot counter at each boot and show it on the home screen #154

[tsusanka]

Also #994 should be taken into account.

[tsusanka]

@hiviah we will prepare the design however this issue is the foundation of what we would like to have in the next bootloader release. So while we prepare the design we can make funcionality for the items mentioned above (Display firmware info, fingerprint, wipe, reboot, boot counter).

And having #1047 would be cool as well.

[tsusanka]

Design added. Upon discussion in the Product team we have decided not to do the Boot counter #154 for now because it increases complexity of the bootloader slightly, complicates the menu (well adds one more item) and the UX is not very great anyway. So there should be only three items:

• Reboot - reboots and launches firmware
• FW info - prints firmware version and fingerprint (maybe also 'vendor' if there is space, see features)
• Factory reset - wipe (the same thing that happens when WipeDevice is received)

For the first and third item there should a screen "Are you sure?". I'll try to obtain design for that one as well.

[tsusanka]

@hiviah Design finalized in Zeplin (link above).

[mcudev]

Reboot is misleading to technical users and lacks meaning to regular users. I'd maybe suggest Launch or Continue or actually an arrow pointing forward icon or a cog icon to indicate execution. Due to restrictions set in the boardloader, the only real reboot is to unplug and since we're in the bootloader already, the only other option is forward to the firmware. FWIW, what people know as a "restart" right now is really the bootloader proceeding forward to the firmware.

A plug icon next to the hamburger that connects the USB stack and changes color to indicate being enabled when pressed could be useful.

[Hannsek]

Additional screens for redesigned bootloader:
Waiting for host

Confirm to wipe

Wiping device

Fail

Welcome screen

successfull FW instalation

succesfull wiping

do you want tu install FW

For now, we have decided not to include Fingerprint screen in the bootloader. Because of that, firmware info from the menu screen has to be removed. New screen:

[Hannsek]

There were some changes regarding Bootloader screens: rebooting, fail, welcome screen.
Also, some new screens were added. See https://www.figma.com/file/l0gG9XeRJ8FTDQ3cfb1wv9/Trezor-T%2C-Trezor-One?node-id=4081%3A19006

[sime]

Please solve #2316 before closing.

[Hannsek]

RSOD + wipe code entered: