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Free · Mac & Windows

15CE Flasher

Flasher for the HP 15c and 16c Collector's Editions.

Guided app for Mac and Windows over the official pogo cable. The app walks you through every step.

Install help & troubleshooting →
15CE Flasher — guided flashing wizard

macOS 13+

Mac

Download freev1.4.1 (245)

Notarized DMG

Verify download (SHA-256)
  1. Filename: 15CEFlasher-1.4.1-245.dmg
  2. In Terminal: shasum -a 256 /path/to/15CEFlasher-1.4.1-245.dmg
  3. Expected: bcc7e69336cdaaf0028a8aa253d8ecee33ab033440841ca425ee80ef5ed03df0

Windows 10/11 · 64-bit

Windows

Download freev1.2.0 (113)

Self-contained app · unsigned (see SmartScreen note below)

Verify download (SHA-256)
  1. Filename: 15CEFlasher-Win-1.2.0-113.exe
  2. In PowerShell: Get-FileHash -Algorithm SHA256 "$env:USERPROFILE\Downloads\15CEFlasher-Win-1.2.0-113.exe"
  3. Expected: 33cfc9db188879df637190a31fe9e313ac557c388564ee61358a9ae6fdd218ed

Modes

DEMO walks through the wizard with a simulated calculator — no hardware required. FLASH is the full seven-step wizard for one calculator. BATCH flashes many calculators in sequence with the same firmware. Connection Probe lets you confirm the cable and SAM-BA detection on real hardware before flashing firmware.

Step-by-step workflow

A seven-step wizard with diagrams and navigation. Status feedback when the cable and SAM-BA connect. No other software to install.

Safe flash layout

Writing starts at address 0x04000. The SAM-BA bootloader below that is left intact. Optional backup before you flash; verify after write; checksum check on the calculator when you're done.

What you need

  • A Mac (macOS 13+) or a PC (Windows 10/11, 64-bit)
  • HP 15c Collector's Edition, HP 16c Collector's Edition, or a post-2015 HP 12c.

    All three use the same ATSAM4LC2C chip. Flash only firmware made for your model.

  • Official USB-C (or USB-A) pogo programming cable. You can get it at The Calculator Store or hpcalc.org.
  • A 114,688-byte (112 KB) firmware .bin — not included with this download (see the install help)

Windows SmartScreen

The Windows build is unsigned. If SmartScreen blocks the app, choose More info → Run anyway.

Privacy

Offline. No telemetry, no network, no automatic diagnostics.

Mach II Labs is not affiliated with HP, Atmel, or Microchip. The download does not include HP firmware. Flash helper applet from Atmel SAM-BA 2.16 redistributed under the SAM Software Package License.