KeyOS v1.4.1 Release

WHAT'S CHANGED

This release focuses on reliability, battery care and update speed. It makes firmware updates much faster, improves how Passport Prime charges and protects its battery, and fixes a Bitcoin app crash when reviewing multisig signers, along with several Airlock and USB issues.

NEW FEATURES

• Passport Prime now shows a full-screen alert when the battery reaches 2% or lower, warning that it will shut down automatically. Plugging in dismisses the alert. If you unplug before the battery reaches a safe level, the alert returns.

IMPROVEMENTS

• Firmware updates are significantly faster. We replaced bzip2 compression with zstd, now use hardware-accelerated SHA256, and optimized how updates are written to storage.
• Charging is gentler on the battery. Instead of cycling between 4.4V and 4.25V when full, Passport Prime now holds a steady 4.3V. This reduces long-term wear and makes the battery percentage more accurate.
• Passport Prime now shuts down cleanly before the battery runs flat, even if the battery percentage has drifted after many partial charges.
• Added USB connection related logging for easier troubleshooting

BUG FIXES

• Fixed a Bitcoin app crash that could occur when scrolling through the signers while reviewing a multisig transaction.
• Fixed a UI bug impacting Bitcoin chart rendering
• Fixed USB issues that could cause Airlock to hang Windows Explorer, leave microSD cards and USB drives unreadable after Passport Prime wrote to them, or stop iPhones and some laptops from recognizing Passport Prime over USB after a reboot.
• Fixed the launcher price graph overlapping the price and BTC labels. The layout now matches the updated design, and older price history is drawn more faintly so it no longer hides the numbers.

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AI security review by Claude Opus 5.5 Max on Ultracode and GPT 6.1 Sol on Ultra found no Critical security issues.