Kern v0.0.6

Changed

• Address scan: progress dialog during sweep; per-round batch raised from 50 to 100
• Compact keypad layout on wave_35
• just: isolated per-board build dirs (build_<board>/); new submodules command
• CI runs on every commit of a PR
• Updated cUR submodule

Fixed

• Camera luminance pulsing (disable ESP32-P4 ISP AE loop; widen OV5647 stable band)
• Scanner settings overlay caused white flashes on wave_5
• Focus-motor V4L2 probe spammed logs on boards without DW9714
• Splash screen artifact on warm reset (stale framebuffer)
• Wallet settings: Apply button cropped; pending edits preserved across descriptor manager trip
• PIN error modal disappearing on mismatch / wrong PIN
• PIN anti-phishing reveal hidden behind keyboard on wave_35; now requires explicit Continue
• Derivation path parser rejects H as hardened marker

Flash instructions

Do not use this firmware with real funds.

Kern v0.0.5

Added

• Support for Waveshare ESP32-P4-WiFi6-Touch-LCD-5 (wave_5, 720x1280 MIPI DSI)

Changed

• Updated k_quirc submodule - Better low density QR code decoding
• Mnemonic storage: show name/ID after saving; larger delete button

Fixed

• Entropy capture camera preview too zoomed in on small displays; uses PPA downscale instead of center crop
• KEF encrypt strength label overlapping keypad on wave_35

Flash instructions

Do not use this firmware with real funds.

Kern v0.0.4

Fixed

• Screen rotation, not working with lgvl_adapter, was removed
• Scanner PPA Q4.4 quantization
• Dice rolls label overflowing the keypad on wave_35; truncates with "..." indicator when full

Flash instructions

Do not use this firmware with real funds.

Kern v0.0.3

First Multi-device Pre-release

Added

• Multi-device support: Waveshare ESP32-P4-WiFi6-Touch-LCD-3.5 (wave_35, 320x480 SPI)
• Linux simulator with V4L2 webcam support for QR scanning and entropy capture
• PMIC support (AXP2101) with battery level indicator and power-off
• Camera settings overlay with adjustable exposure, focus, and autofocus controls
• Persistent camera AE target and focus position (NVS)
• CI jobs for automated builds
• BIP32 derivation path parser tests

Changed

• Upgraded camera resolution to 1280x960
• Improved QR decoder performance; max QR version raised to 25
• Migrated wave_4b BSP to esp_lv_adapter and trimmed display API
• Bumped ESP-IDF to early 6.1 with relevant bugfixes
• Gated dev tools behind build configuration
• Addresses page: replaced Receive/Change toggle with dropdown
• Added processing dialog during PSBT signing
• Larger button surfaces on UI

Fixed

• QR alignment pattern detection: use centroid instead of region seed
• BIP32 derivation path parsing
• Dialog titles better fit within bounds
• Watchdog timeout increased to accommodate PIN PBKDF2 processing
• Simulator PIN behavior aligned with device
• Correct BTN_COUNT macro calculation in keyboard

Flash instructions

Do not use this firmware with real funds.

Kern v0.0.2

Warning: Mnemonics and descriptors stored on flash with v0.0.1 will be lost, as this version changes storage partitions mapping.

Changes

• Migrate to ESP-IDF v6.0
• OTA-ready partition table (factory + dual OTA, 16MB flash)
• Message signing (prove address ownership)
• Smart Scanner: unified scan on home page handles PSBTs, messages, addresses, descriptors, and mnemonics
• Display rotation setting (0/90/180/270) with PPA hardware counter-rotation for camera
• PPA-accelerated bilinear downscaling for QR decoding
• Blue Wallet multisig descriptor parsing
• Replace local ST7703 fork with upstream Espressif component v2.0.2
• UX: larger button surfaces
• Code quality improvements (cppcheck, clang-tidy)

The firmware targets Waveshare ESP32-P4-WiFi6-Touch-LCD-4B board using OV5647 camera (auto-focus disabled).

Flash instructions

Do not use this firmware with real funds.

Kern v0.0.1

First Kern pre-release, aimed for those willing to test and contribute to Kern with bug hunting and suggestions, without installing the tool-chain and building the firmware from source code.
The firmware targets Waveshare ESP32-P4-WiFi6-Touch-LCD-4B board using OV5647 camera (auto-focus disabled).

Flash instructions

Do not use this firmware with real funds.