Valetudo RE 0.9.0
This is the next release of RE version, verified on S55 (fw 2008). It brings two major changes:
Support for 'rooms' conception of 2008 firmware on Gen2 devices
This includes viewing and editing how the device automagically split the map into the 'segments', and then sending device to clean a number of them. Note that not only it allows direct room cleaning, but also it's now possible to select some rooms in normal scheduled cleaning task to be worked on at a specified time. Obviously all of this is possible only on Gen2 vacuums using 2008 firmware.
Updated interface for Telegram bot
I've got rid of manually typing commands as those really felt boring and inconvenient. Now it's possible to do almost all the tasks just by clicking buttons in some menus. Which, surprisingly, will appear by typing almost any command. Or anything. Yes, exactly that simple. Unfortunately, possibilities of tuning telegram inline menus are limited, so it looks the best I've came up with. If anyone has better ideas on how it could be improved with current telegram capabilities, feel free to suggest.
Lesser changes include a number of fixes, it's now possible to reset consumables and specify the number of repeats per zone on zoned cleaning using mqtt commands, scheduled cleaning timers now can have arbitrary names, integrated firmware update installer is now able to show simple statuses of ongoing updates (but there's still no way to get full error messages from it), finally @Xento introduced a simple dark color scheme for web interface.
Some notes about 2008+ firmware version:
Unfortunately the manufacturer decided to start using a really cut down version of Ubuntu for Gen2, and it's no more possible to simply take a stock firmware and just throw a valetudo binary into it. So this time instead of simply rooted via dustbuilder's image builder firmware we have to use @zvldz's (thanks!) one, which also puts some missing tools back into the image and adds some tuning like downgrading included miio-client to be less aggressive. For manual building I suggest going that way too. Default SSH login is root and password is cleaner. Additionally you should know that installed 2008 firmware can't be further reflashed using common methods, so you should use an update dialog at Settings -> Info for that matter.
Since we have such a massive changes for Gen2, I've also decided to use an updated image for Gen1 vacuums as well: it is now version 4004 that is also prepared with the aforementioned new image builder. But generally it shouldn't change much for Gen1 users.
There are some accusation of 4004 image may have issues getting the map from the device, so it is temporarily removed. Meanwhile you can use Gen1 images from vacuumz.info (created by @zvldz), the images you are looking for are prefixed as vacuum_valetudo_re.
Prebuilt binaries are now based on Node.js 12.15.0 if that mean anything to anyone, and deb distributive file is still available for those who may decide staying with older base firmware images.