Firmware for the HC 1705 is rarely needed unless:
Download sites like "softonic.com" or "download.cnet.com" – they bundle adware. Prefer GitHub, manufacturer sites, or trusted electronics forums.
Some newer HC 1705 signs include Bluetooth. Search your app store for:
Search for the HC-LED app in the Apple App Store or download the Android version directly from led75.com .
Last updated: March 2025 – Software links change frequently; always verify compatibility.