v0.4.0

Features

• Backflush cleaning (boards with the paddle harness) — a guided,
  full-screen cleaning mode under Settings → Micra → Cleaning. Fit the
  blind filter, tap Go, and the device pulses the group 10 times with a
  live cycle counter and countdown. Cancel stops it and stays put,
  Back stops it and leaves, and flipping the physical paddle stops it too.
  • Pulse length follows your Auto flush setting. If your machine
    preinfuses, note that every pulse restarts preinfusion — set Auto flush
    long enough that each pulse outlasts it, or turn preinfusion off while
    backflushing.
• Flush button on Home (paddle boards, 4.3" and larger) — the Micra
  card's single button is now Standby | Flush, mirroring the scale card's
  Disconnect | Tare. Flush runs the group for a quick rinse; tap again to stop
  early.
• Delete individual shots — open a shot from Stats → History and tap
  the trash button. The shot is removed from the SD card and the headline
  stats recalculate without it, so dial-in and practice shots no longer skew
  your accuracy numbers.
• Auto flush is now Off / 3 / 6 / 9 / 15 s (was Off / 3 / 6). This single
  duration drives every timed run of the group: the post-shot auto-flush, the
  new Flush button, and each backflush pulse.

Improvements

• Settings → Device is split into Display, Time & date, and WiFi. The old
  single page had grown long enough that reading it meant scrolling past most
  of it; each sub-page now fits on screen.
• Setting the clock is faster — Time (hour, minute) and Date (month, day,
  year) are now dropdown pickers on one row each, replacing six separate
  −/+ rows. Timezone moved here from the WiFi page, where it never really
  belonged: it governs how every time is displayed, not just NTP.
• Flush settings live with cleaning — Auto flush and Flush delay moved to
  the new Micra → Cleaning page alongside Backflush, which also shortens
  the Micra settings page.
• The Micra button on Home shows the action, not the state. It reads
  Standby / Turn On / Connect and is simply disabled when unavailable; the
  connection state was already spelled out in the card's status line, and the
  old wording no longer fit beside Flush.
• The manual now says what it should about storage: a small SD card is more
  than enough. A shot is a few tens of KB, so even a 1 GB card holds years
  of espresso — and small cards are usually already FAT32.

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Apollo 2 firmware v0.4.0 — one flashable image per supported
Waveshare board (bootloader + partitions + app combined; flash at
offset 0).

Easiest install: the web flasher —
plug the board in and flash from Chrome, no tools needed.

Command-line alternative:

esptool.py write_flash 0 apollo2-<board>-v0.4.0.bin