Firmware Version 1.2 (July 31, 2025)
Improves freefall exit volume response time.
SonoAlti_4V_Firmware_1_2.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