Firmware Version 1.6 (July 1, 2026)
Fixed bug with freefall threshold on Preset 2.
SonoAlti_4V_Firmware_1_6.uf2

Flash Revealer: SonoAlti_4V_16MB_Flash_Revealer.uf2
Flash Eraser: SonoAlti_4V_Flash_Eraser.uf2
SonoAlti 4V Sounds: SonoAlti_4V_Sounds.zip

SonoAlti 4V Hardware Diagnostics: SonoAlti_4V_Hardware_Diagnostic_Test.uf2