Arco Unleashed v1.1.4 (Bookworm 6.18.30)

Latest build — 2026-08-25 (v1.1.4). Five things an owner will notice.

(1) The console is readable again. Phrozen's firmware narrates itself constantly — the serial link
being re-initialised before every send, each 16-byte AMS frame printed byte by byte, the firmware version
one field per line. All of it scrolled the welcome banner away within seconds of a print starting. Of 357
console lines from a real print, six now show, and those six are the banner and actual commands. A jam
report and a missing AMS still come through: the patterns are built around keeping them.

(2) One dialog for the AMS. Which slot each tool pulls from, and the refeed switch, in a single
place — AMS_SETUP in the Macros panel. Picking the same slot for two tools is allowed: that is how
you print a four-colour file from two loaded spools. And the old AMS on / off switch is gone — the
unit enumerates as a USB device and the printer follows it by itself, so there is no longer a setting
that can disagree with the hardware.

(3) The printer shows what is plugged in. AMS and USB Stick each get a line under
Miscellaneous, green when connected and red when not. They are indicators, not buttons — clicking
one does nothing, on purpose. Fluidd shows the same two in its Runout sensors card.
Fluidd ships that card switched off, so a fresh printer now switches it on by itself; on a
dashboard you have already arranged it is left alone, and the setup menu still offers it
(w → s).

(4) A print that starts with nothing loaded is stopped. The toolhead filament sensor is visible to
the web interface for the first time, and a job that begins with an empty toolhead is paused instead
of laying down air for hours. A print running without runout protection now says so in the console rather
than staying quiet about it — and it waits until printing has actually begun, so it no longer speaks up
while the bed mesh is still probing and the start G-code has not set the mode yet.

(5) An update from the web interface now finishes the job. Installing an update from Mainsail
or Fluidd is a plain git pull, so anything that needed root — a service, a boot hook, the theme —
was left unapplied without a word. On a printer flashed from an older image that could stay true
indefinitely: every file present, nothing switched on, and no message saying so. An update now
arms the remaining work and applies it at the next start, by itself.

Arco Unleashed — Full Image (pre-built, flash & run)

A complete Debian Bookworm + Klipper image for the Phrozen Arco. Includes the Klipper stack,
the arco-unleashed kit (setup menu, AMS auto-mode, Mainsail theme) and the Arco configuration.
No proprietary Phrozen software is included — you supply Phrozen's official Arco_FW_V*.zip on a
USB stick at first boot.

📦 What to download

Asset	You need it for
Arco-Unleashed-USB.zip	everything — the image, its checksums, the self-flash tool and all guides. Extract it to the top level of a FAT32 USB stick.
collect_data_arco.sh	Step 0 below — grab it on its own so you can run it before downloading the big archive.
Arco-Reflash-to-Buster-USB.zip	only if you ever want to go back to stock Phrozen Buster.

The image is no longer offered as a separate download — it lives inside Arco-Unleashed-USB.zip
together with its .sha256 and .rawsize, so there is one thing to fetch and nothing to mismatch.

Before you flash — collect data from your running printer (required)

Some data the Arco needs is not in Phrozen's Arco_FW_V*.zip (phrozen_master + ~/hdlDat) —
without it the AMS detection hangs and the display misbehaves. Grab it from your still-running
original printer: download collect_data_arco.sh from this release, put it on a FAT32 USB
stick, plug that into your original Arco, SSH in, then:

bash ~/printer_data/gcodes/USB/collect_data_arco.sh ~/printer_data/gcodes/USB

(If the stick auto-mounts elsewhere, run lsblk and use that path.) This writes
arco-phrozen-ams.tar.gz onto the stick — keep it there for the install below.

Two ways to flash

Path A — easy direct flash (self-flash, no teardown). The running printer overwrites its own eMMC.
Proven end-to-end on hardware, but one shot, no net.

1. Extract Arco-Unleashed-USB.zip onto the root of a FAT32 stick. Add Phrozen's official
   Arco_FW_V*.zip and your collected arco-phrozen-ams.tar.gz next to it.
2. Plug it into the printer, SSH in as mks. The stick auto-mounts at ~/printer_data/gcodes/USB (stock
   printer and Unleashed). If that folder is empty, mount it to that same path yourself —
   sudo mkdir -p /home/mks/printer_data/gcodes/USB && sudo mount /dev/sda1 /home/mks/printer_data/gcodes/USB
   (lsblk shows the partition). Then:

   cd ~/printer_data/gcodes/USB                         # where the stick auto-mounts
   sh prepare_unleashed_self_flash.sh                   # unpacks the tool to ~/selfflash
   sudo bash ~/selfflash/install-unleashed.sh           # inspect only — changes nothing
   sudo bash ~/selfflash/install-unleashed.sh --arm     # verify, confirm, arm, reboot

3. Leave the stick plugged in. The display shows three named steps (check → write → verify), the
   printer reboots itself, seeds its WiFi from the stick and installs Phrozen's parts from it.

If something goes wrong before the write begins — image missing, checksum mismatch, or the flasher
hangs — pull the USB stick and power-cycle. With no image on the stick the flasher stands down and
your existing system boots normally. Once the write has begun, only path B recovers the printer.

Path B — eMMC replacement / recovery. The proven route, and how you recover from a failed path A.

1. Extract Arco-Unleashed_bookworm_6.18.30.img.gz out of Arco-Unleashed-USB.zip — that file is
   what balenaEtcher writes.
2. eMMC out → USB adapter → flash it with balenaEtcher → eMMC back in.
3. Put Phrozen's official Arco_FW_V*.zip and the collected arco-phrozen-ams.tar.gz on a
   FAT32 USB stick. First boot: Wi-Fi portal → the display then installs Phrozen's parts from it.

If the printer never comes online after the flash

Wait ~90 seconds first — that is how long it tries the seeded Wi-Fi before raising its own
Arco-Unleashed-Setup hotspot for your phone. If neither appears, put a wifi-seed.txt on the
stick with three lines (SSID=, PSK=, COUNTRY=) and power-cycle: the first boot re-runs on every
power-cycle until Phrozen's firmware is installed, so it picks the file up and joins your network. Full
details in the QUICKSTART inside the archive — worth knowing, because a printer in that state has no
network, so the guides on the stick are the only ones you can open.

Afterwards (either path): SSH in as mks, set your own password, flash the MCUs and re-calibrate.
Only the toolhead F103 needs a hands-on button step, and only once — the MANUAL explains why.

See the README / QUICKSTART for the full procedure.